The exarch of Ravenna, having invited Duke Tasso of Friuli to Oderzo for a ceremonial beard-cutting, has him hunted down and killed along with Kakko in 617.

Radoald and Grimoald flee to Arechis I of Benevento and Friuli passes to their uncle Grasulf II.

The Chronicle of Fredegar records a story of how Isaac the Armenian slew Tasso, duke of Tuscany, by deceit for the benefit of the Lombard king Arioald.

However, according to Paul the Deacon, it was the patriarch Gregory who killed Tasso, and Tasso was instead the Duke of Friuli with his brother Kakko.

The Cathedral of Santa Maria Assunta (Cattedrale di Santa Maria Assunta), a basilica church on the Venetian island of Torcello, is a notable example of Venetian-Byzantine architecture.

One of the most ancient religious edifices in the Veneto, it is founded by the exarch Isaac of Ravenna in 639, confirming the island's importance as a center of population in Venice at this date.

Pope Severinus had finally succeeded Honorius I as the seventy-first pope on May 28, 640.

During the short time he is pope, Severinus condemns the Ecthesis.

Convening a synod, he decrees that “as there were two natures in Christ, so there were two natural operations.” He also renews the mosaics in the apse of Saint Peter’s Basilica.

Unfortunately Severinus was already quite old when his election was confirmed, and his reign is only two months long when he dies on August 2, 640.

Pope John IV succeeds Severinus as the 72nd pope; his election on December 24 is accepted by the Exarchate of Ravenna.

Maurikios Chartoularios names himself dux of Rome and revolts against exarch Isaac (Exarchate of Ravenna).

He declares Rome's independence from the Exarchate and from the Empire itself.

Emperor Heraclius had demanded in 638 that the newly elected Pope, Severinus, sign his assent to the Ecthesis, a document which defined monotheletism as the official imperial form of Christianity.

When Severinus refused, Heraclius had in turn refused to recognize him as Pope, and had sent his chartoularios (secretary) Maurikios to Rome to obtain the Pope’s agreement to the Ecthesis.

After his arrival, Maurikios, with the support of the local Roman militia, had occupied the Lateran and plundered the papal palace.

The Exarch Isaac had also rushed to Rome and seized the Lateran treasure for the emperor, although he and Maurikios have retained a significant portion for themselves.

As a result, for almost two years Severinus had been denied access to his office.

Maurikios, now the dux of Rome, attempts to repeat his successful action in 643, but this time he is determined to not share any of the plunder with anyone.

He revolts against Isaac, and declares Rome’s independence from the Exarchate and from the emperor, Constans II.

In response, Isaac dispatches his magister militum Donus, who crushes the revolt.

Maurikios seeks sanctuary in the church of Saint Maria ad Praesepe, but he is dragged from the church and sent in chains to Ravenna and beheaded.