A rising internal conflict in Sicily itself soon took up most of the attention of Ibrahim's Sicilian governors. Since the beginning of the Ifriqiyan conquest of the island in the 820s, Arab and Berber colonists had been at odds with each other. Arab colonists, concentrated in the northern part of the island, had come with the first wave of conquest and Arab lords staked out vast tracts in the center for regimental fiefs. But Berber immigration, concentrated in the south, was more numerous post-conquest. Population pressure prompted Berber colonists to begin encroaching on the Arab regimental lands, provoking internal clashes. Ibrahim II's Sicilian governors, reflecting their master's prejudices, tended to find in favor of the Berbers and against the Arab lords.