Why did Abd-Rahman III build a huge standing army?

Abd-Rahman III built a huge standing army to consolidate his power and protect the Umayyad Caliphate of Córdoba from both internal dissent and external threats. By maintaining a professional military force, he could effectively manage territorial disputes and defend against rival factions, including Christian kingdoms in the north. This military strength also enabled him to assert dominance and enhance the prestige of his caliphate, ensuring stability and promoting economic growth in the region.