Passage: His son and successor, Ali ibn Yusuf, was viewed as just as devout a Muslim as his father. Córdoba, in about 1119, served as the launch pad for Andalusian insurrection. Christians on the northern frontier gained momentum shortly after his father's death, and the Almohads, beginning about 1120, were to engulf the southern frontier. This ultimately led to the disintegration of Yusef's hard-gained territories by the time of Ibrahim ibn Tashfin (1146) and Ishaq ibn Ali (1146–1147), the last of the Almoravid dynasty.

Question: Whose territories were denigrated?
Yusef