The De Administrando Imperio mentions Emperor Heraclius as having settled the White Croats in Croatia after they had expelled the Avars, during the rule of Porga's father.

Heraclius apparently sent priests from Rome, and appointed an archbishop, a bishop, elders and deacons of these, and baptized the Croats, which are at this time under the rule of Porga.

Duke Mislav, who in 835 had succeeded Vladislav as the Duke of Littoral Croatia, rules from Klis Fortress in central Dalmatia.

A pious ruler, he builds the Church of Saint George in Putalj (on the slopes of the hill Kozjak).

He is chiefly known for signing a treaty in 839 with Pietro Tradonico, doge of the Venetian Republic, that leads to the growth of Croatian sea power, as Mislav models Croatian ships after those built by the Neretvians and Venetians.

Unlike his predecessor, Mislav maintains good relations with the neighboring coastal cities of Dalmatia.

…the Mongols under the leadership of Kadan (Qadan) suffer a major defeat at Klis Fortress, near Split, in March 1242.

Saint Margaret, a daughter of Béla IV and Maria Laskarina, was born in Klis Fortress on January 27, 1242, during the Mongol invasion of Hungary-Croatia.

Much of Croatia has been plundered and destroyed.

Croatian lords, acting on King Louis’s orders, besiege and capture Klis, a Dalmatian fortress that Stephen Dušan's sister, Jelena, had inherited from her husband, Mladen Šubić.