The peasantry was still upset they were usurped their rightful title to the land. In 1390, his grandson John VII briefly usurped the throne, but was quickly overthrown. Whether Sargon usurped the Assyrian throne or not is disputed. Frederick has usurped the duchy and exiled his older brother, Duke Senior. Kamsa usurped the throne of Mathura after imprisoning Ugrasena. He then usurped the Jin throne and created the Song dynasty. Thus, Carol usurped the throne from his son, becoming King Carol II. In 1402, Zhu Di usurped the throne and became the Yongle Emperor. I, Priscillian appealed to Magnus Maximus, who had usurped the throne from Gratian. After Phocas usurped and killed Maurice, the Persians invaded the empire in 603. However Sima Ai was discontent with Jiong's rule, who he considered to have usurped authority. Eventually, Sejong's second son, Sejo, usurped the throne from Danjong in 1455. In AD 9, he usurped the throne, and founded the Xin Dynasty. There were many, however, whose positions eroded and were eventually usurped by more capable underlings. After then being driven into exile by the Javanese, he usurped control over Temasek.