1230
Leon and Castile united under Ferdinand III
On the death of his father Alfonso IX of Leon, Ferdinand III already king of Castile permanently joined the two Christian kingdoms. With a unified Iberian war machine behind him he would shortly take Cordoba and Seville from the fragmenting taifa states. The union created the largest Christian kingdom in the peninsula and the military force that would reduce Muslim Spain to the rump emirate of Granada.
Mongols destroy the last Xi Xia resistance
Three years after Genghis Khan's death, Mongol armies completed the subjugation and near-extermination of the Tangut people of Western Xia. Entire valleys were depopulated; the distinctive Tangut script, derived from Chinese, began its slow slide toward oblivion. The thoroughness of the destruction was so complete that the Tangut civilization was nearly forgotten until twentieth-century archaeologists rediscovered their buried cities in the Gobi Desert.
Manco Capac legend placed at Cuzco
Inca oral tradition, later recorded by Spanish chroniclers, remembered this generation as the age of the first Sapa Inca Manco Capac, who planted his golden staff into fertile soil at Cuzco and founded the dynasty. Historical reality remains murky, but a kingdom was taking shape. The sacred valley of the Vilcanota, with its terraced slopes and reliable water, provided the agricultural base for an expansive highland polity.
Tran dynasty reforms Vietnamese administration
The new Tran rulers of Dai Viet reorganized the government, created a system of hereditary military fiefs, and established a national examination system modeled on Song China. They reinforced the Red River dike network and trained a standing army of peasant conscripts. These reforms would give Vietnam the administrative and military backbone to survive three Mongol invasions in the coming decades.