Avicenna continues to write compendious works, producing a notable philosophical encyclopedia and numerous works on medicine.

The Book of Healing (Arabic: Kitab Al-Shifaʾ, Latin: Sufficientia) is a scientific and philosophical encyclopedia.

Despite its English title, it is not concerned with medicine.

Also called The Cure, it is intended to "cure" or "heal" ignorance of the soul.

He probably began to compose the al-Shifa in 1014, completed it around 1020, and published it in 1027.

The book is divided into four parts: logic, natural sciences, mathematics (a quadrivium of arithmetic, geometry, astronomy, and music), and metaphysics.

It is influenced by ancient Greek philosophers, such as Aristotle, Hellenistic thinkers such as Ptolemy, earlier Persian and Muslim scientists and philosophers such as Al-Kindi (Alkindus), Al-Farabi (Alfarabi) and Abū Rayhān al-Bīrūnī.

The book proposes the theory that Venus is closer to Earth than the Sun.

Ibn Sina's theory on the formation of metals combines Jābir ibn Hayyān's sulfur-mercury theory from Islamic alchemy (although he was a critic of alchemy) with the mineralogical theories of Aristotle and Theophrastus.

He creates a synthesis of ideas concerning the nature of the mineral and metallic states.

Avicenna suggests a hypothesis about the origin of mountain ranges, and contributes to paleontology with his explanation of how the stoniness of fossils was caused.

Aristotle previously explained it in terms of vaporous exhalations, which Ibn Sina modified into the theory of petrifying fluids (succus lapidificatus).

Avicenna discusses the mind, its existence, the mind and body relationship, sensation, perception, etc.

He writes that at the most common level, the influence of the mind on the body can be seen in voluntary movements, in that the body obeys whenever the mind wishes to move the body.

He further writes that the second level of influence of the mind on the body is from emotions and the will.

He also writes that strong negative emotions can have a negative effect on the vegetative functions of an individual and may even lead to death in some cases.

Avicenna also gives psychological explanations for certain somatic illnesses, and he always links the physical and psychological illnesses together.

North Africa is now completely in the hands of Berber dynasties, and the Maghrib has begun to assume its natural tripartite character, with the Maghrawa tribe dominating the region of present Morocco and …

…the two Zirid Emirates, Al Qal'a of Beni Hammad and …

…Kairouan, respectively controlling that of present Algeria and Tunisia.

Al-Muizz ibn Badis had ascended the Zirid throne of Ifriqiyah as a minor following the death of his father Badis ibn Mansur, with his aunt acting as regent.

In 1016, there had been a bloody revolt in Ifriqiya in which the Fatimid residence Al-Mansuriya had been completely destroyed and 20,000 Shiites had been massacred.

The unrest had forced a ceasefire in the conflict with the Hammadids of Algeria, and their independence had finally been recognized in 1018.

Al-Muizz had taken over the government in 1022 following the overthrow of his aunt.

The relationship with the Fatimids is strained when, in 1027, they support a revolt of the Zenatas in Tripolitania, which results in permanent loss of control of the region.

Sancho III of Navarre and the Seizure of Castile (1016–1027 CE)

In 1016, Sancho III of Navarre defines the border between Navarre and Castile, strengthening his alliance with Count Sancho García of Castile through marriage to his daughter, Muña Mayor Sánchez (Muniadona).

Following Sancho García’s death, in 1017, Sancho III assumes the protectorship of Castile on behalf of young García Sánchez, further consolidating his influence over the region.

The Assassination of Count García Sánchez (1027 CE) and Its Aftermath

Relations between the Christian kingdoms of León, Castile, and Navarre deteriorate after the assassination of García Sánchez in 1027.

• García had been betrothed to Sancha, daughter of Alfonso V of León.
• As part of the marital pact, León was set to gain Castilian lands between the Cea and Pisuerga rivers, expanding its influence.
• However, upon arriving in León for the wedding, García Sánchez is murdered by the sons of a noble he had previously expelled from his lands.

Sancho III, who had opposed the marriage and the Leónese territorial expansion into Castile, seizes the opportunity to reverse the expected outcome.

Sancho III Takes Control of Castile

Using his role as protector of Castile as a pretext, Sancho III immediately occupies the county, asserting his authority over the region. He installs his younger son, Ferdinand, as Count of Castile, thus fully integrating the county into his sphere of influence and blocking León’s expansion.

This move significantly enhances Navarrese dominance in northern Iberia, setting the stage for the future rise of Castile as an independent power under Ferdinand I, who would later become King of León and Castile.

Ernest II of Swabia: Rebellion and Imprisonment (1015–1027)

Ernest II of Swabia, the elder son of Duke Ernest I, inherited the Duchy of Swabia in 1015 as a minor. His reign was defined by continuous conflicts with his stepfather, Emperor Conrad II, particularly over the autonomy of Swabiaand the succession to the Kingdom of Burgundy. His repeated rebellions against imperial authority ultimately led to his imprisonment and political downfall.

Early Rule and Regency (1015–1024)

• Following Ernest I’s death in 1015, the young Ernest II became Duke of Swabia, but due to his minority, the duchy was ruled by a regency.
• His mother, Gisela of Swabia, initially assumed the position of regent before transferring authority to Poppo, Archbishop of Trier.
• In 1016, Gisela remarried Conrad of Franconia, who was later elected King of Germany (Conrad II) in 1024, bringing Ernest into the imperial family but also into conflict with it.

Conflict with Conrad II and the First Rebellion (1025–1026)

• Tensions arose between Conrad and Ernest over Swabia’s independence and their competing claims to Burgundy.
• Both men had a valid claim to succeed King Rudolph III of Burgundy, who was childless.
  • Ernest’s claim came through his mother Gisela, whose mother, Gerberga, was the sister of King Rudolph III.
  • Conrad’s claim rested on his position as King of Germany, which had historic influence over Burgundy’s succession.
• In 1025, Ernest rebelled against Conrad II, refusing to acknowledge imperial authority.
• By 1026, however, Conrad had defeated Ernest’s forces, forcing the young duke to submit.

Imperial Expedition to Italy and Second Rebellion (1026–1027)

• Following his submission, Ernest accompanied Conrad II’s Italian expedition (1026–1027), demonstrating his temporary reconciliation with the emperor.
• During the campaign, Conrad ordered Ernest to return to Swabia to crush lingering resistance to imperial rule.
• However, upon returning, Ernest once again rebelled, joining the local opposition against Conrad rather than suppressing it.

Defeat and Imprisonment (1027)

• Ernest failed to rally Swabian support, as most local rulers remained loyal to Conrad.
• After facing widespread opposition, he was forced to surrender and was imprisoned by Conrad II.
• Despite her support for Conrad, Gisela intervened on behalf of her son, ensuring that he remained Duke of Swabia, though she likely governed in his stead during his captivity.

Legacy and Impact

• Ernest’s repeated rebellions weakened Swabia’s autonomy, strengthening imperial authority in the duchy.
• His failure to secure support from the Swabian nobility showed the limits of ducal power when confronted by a strong emperor.
• While his title was preserved, his imprisonment effectively ended his political influence, marking a turning point in Conrad II’s consolidation of power.

Ernest II’s ambition and defiance made him a significant figure in the feudal struggles of the 11th century, yet his ultimate defeat and imprisonment underscored the growing dominance of the Salian emperors over the German duchies.

Constance of Arles and the Capetian Revolt Against Robert II (1025–1031)

By the late 1020s, tensions within the Capetian royal family erupted into open rebellion, with Queen Constance of Arles encouraging her sons to rise against their father, King Robert II of France. Frustrated by Robert’s favoritism toward his second son, Henry, and the continued denial of Burgundy to her third son, Robert, Constance actively supported and incited their revolt.

Constance's Role in the Rebellion

• Having previously sided with Robert II against their rebellious eldest son, Hugh Magnus, Constance now turned against her husband after Hugh’s death in 1025.
• She urged her surviving sons to seize their inheritance by force, taking advantage of the kingdom’s fragmented feudal structure.
• Her actions reflected the political ambitions of her Provençal family, as she sought to secure power and lands for her children.

The Revolt of Robert and Henry (Late 1020s–1031)

• Robert, Duke of Burgundy, frustrated that his father had never formally granted him the Duchy of Burgundy, launched a campaign against the region.
• Henry, the heir apparent, seized Dreux, a vital fortress and key Capetian stronghold, in defiance of his father.
• Their coordinated attacks targeted castles and towns loyal to Robert II, plunging the kingdom into a succession crisis before the king had even died.

Consequences and Legacy

• Robert II, despite his strong reputation as a pious ruler, was unable to prevent the growing rebellion, as much of the nobility aligned with or against his sons.
• This family conflict weakened Capetian authority, highlighting the fragility of royal power in early medieval France.
• The rebellion foreshadowed the greater succession crisis that would unfold after Robert II’s death in 1031, when Constance continued to oppose Henry’s rule.

The Capetian revolt of the late 1020s was a direct consequence of Robert II’s divisive succession policies, aggravated by Constance’s political maneuvering and ambition. Her encouragement of her sons’ rebellion nearly fractured the royal dynasty, underscoring the complex nature of Capetian inheritance and the ongoing struggle for territorial control in medieval France.

King Robert II's Capitulation and the Temporary Capetian Peace (1030–1031)

Following a prolonged rebellion led by his sons, Henry and Robert, King Robert II of France was ultimately forced to retreat to Paris, unable to effectively suppress their uprising. Facing increasing pressure and internal instability, the king reluctantly conceded to their demands, restoring peace within the Capetian dynasty—at least temporarily.

Robert II’s Reluctant Concessions

• After his sons’ relentless attacks on royal lands, including Henry’s seizure of Dreux and Robert’s campaign against Burgundy, the king could no longer sustain his resistance.
• Weakened and unable to rally enough support, Robert II negotiated with his sons, agreeing to a peace settlement.
• The terms of the agreement likely included:
  • Recognition of Henry as heir to the throne while securing lands and influence for Robert.
  • Territorial concessions to prevent further uprisings.
  • A fragile reconciliation between Constance of Arles and Robert II, as she had actively encouraged the rebellion.

A Short-Lived Peace (1030–1031)

• The truce brought a temporary end to hostilities, ensuring relative stability within the Capetian realm.
• However, the underlying tensions remained, as Constance continued to favor Robert over Henry, fueling further succession disputes.
• The peace lasted only until Robert II’s death in July 1031, after which new conflicts erupted, with Constance actively opposing Henry’s ascension to the throne.

Legacy and Impact

• This episode demonstrated the fragility of early Capetian rule, where royal authority remained vulnerable to internal feudal pressures.
• Henry’s position as heir remained uncertain, leading to further strife after Robert’s death, when his mother and younger brother challenged his kingship.
• The conflict highlighted the precarious balance of medieval French monarchy, where kings struggled to enforce primogeniture and dynastic stability.

Robert II’s final years were overshadowed by rebellion, and though he secured peace before his death, the succession crisis that followed ensured that the Capetian dynasty remained embroiled in internal conflict well into Henry I’s reign.

Aribert journeys to Rome for the imperial coronation of Conrad by Pope John XIX on March 26, 1027 in an impressive ceremony, attended by, among other dignitaries, Cnut, King of England, Denmark and Norway, and overlord of Sweden.