Borommarachathirat, as the lord of Suphanburi, a powerful rival of Ayutthaya, forces King Ramesuan from power and takes the throne of Ayutthaya as its third king.

Known as a great warrior, his reign marks the expansion of Ayutthaya to the north.

Ukhaantu Khan, born Toghun Temür, the Yuan Dynasty Emperor of China, a khanate of the Mongol Empire, has lost China to the Ming Dynasty, and concentrates his preparation for reconquest of China at Khara-Khoto.

He dies here in 1370 and his son Ayushiridara succeeds to the throne.

The Mongolia-based empire maintains its influence, stretching its domination from the Sea of Japan to Altai Mountains.

There are also pro-Mongol, anti-Ming forces in Yunnan and Guizhou.

Even though its control over China had not been stablized as yet, the Ming considered that the Yuan had lost the Mandate of Heaven when the dynasty abandoned Dadu, and that the Yuan had been overthrown in 1368.

The Chinese do not treat Toghun Temür after 1368 and his successor Ayushiridar as emperors.

Poland under King Casimir III had conquered western Podolia in 1366, but loses it after Casimir’s death in 1370.

Emperor Charles IV makes Moravia, Silesia, and Lusatia an indissoluble part of the Bohemian crownlands in 1370.

Poland loses the recently acquired duchy of Mazovia, …

…with its county of Plock, after the death of King Casimir III in 1370.

The Danish side, despite Valdemar‘s diplomatic success, is the loser after nearly three years of warfare.

Under the Treaty of Stralsund concluded in 1370, the Danes are forced to grant commercial rights and privileges to the Hanseatic League and Valdemar, who is permitted to return to Denmark, reluctantly accepts the league’s trade in Denmark.

Louis of Hungary, after the death of Casimir III of Poland on November 5, 1370, arrives after his uncle's funeral and orders the erection of a splendid Gothic marble monument to the deceased king.

He is on November 17 crowned king of Poland in the Krakow Cathedral.

Casimir III had willed his patrimony—including the duchies of Sieradz, Łęczyca and Dobrzyń—to his grandson, Casimir IV, Duke of Pomerania.

However, the Polish prelates and lords are opposed to the disintegration of Poland and Casimir III's testament is declared void.

Louis visits Gniezno and makes his Polish mother, Elizabeth, regent before returning to Hungary in December.

His uncle's two surviving daughters (Anna and Hedwig) accompany him, and the Polish Crown Jewels are transferred to Buda, which raises discontent among Louis's new subjects.

Louis's wife has given birth to a daughter, Catherine, in 1370, seventeen years after their marriage; a second daughter, Mary, will be born in 1371.

Hereafter Louis will make several attempts to safeguard his daughters' right to succeed him.

A branch of the Piast family continues after the death of Casimir III, Poland’s last reigning Piast monarch, to reign in Silesia, recognizing the sovereignty of the Bohemian crown.

Bosnia's ban, the energetic Tvrtko Kotromanic, is challenged by Hungarian aggression and internal uprisings, but manages to establish firm control over a reduced Bosnia by 1370.