How did Iberia Become Muslim?

TL;DR

Iberia became majority Muslim over centuries through elite conversions, economic incentives, intermarriage, and cultural integration rather than forced conquest.

Key Points

• 1.A small Muslim force conquered most of Iberia within 7 years. Starting with a few thousand men crossing into southern Spain in 711 AD, Muslims controlled most major urban centers by 718, establishing Al-Andalus as a province of the Umayyad Caliphate.
• 2.Hispano-Roman and Visigothic elites were among the earliest converts, driven by self-interest. Through negotiated agreements called sulh, aristocrats kept their lands and governing roles by accepting Muslim authority, converting to Islam and becoming known as Muwallads, sometimes fabricating Arab genealogies for higher status.
• 3.Economic pressure from the dhimmi tax system incentivized mass conversion. Non-Muslims paid the jizya poll tax and kharaj land tax, while Muslims primarily owed zakat; the financial burden pushed landowners and working-class people to convert, though early Umayyad authorities sometimes still taxed converts.
• 4.The mawla client system tied converts to Arab tribal lineages, accelerating Arabization. By becoming a mawla of an Arab family, Iberians gained protection, patronage, and social standing in exchange for adopting Arabic language, dress, and customs, intertwining Islamization and Arabization.
• 5.Intermarriage between male Arab conquerors and local Iberian women rapidly grew a native Muslim population. Children of Muslim men and Christian or Jewish women were legally Muslim; within generations, the majority of Al-Andalus's Muslims had local Iberian ancestry while remaining deeply rooted in Arab culture.
• 6.The Reconquista reversed Iberia's Islamization, culminating in the 1492 fall of Granada and the 1609 expulsion of 300,000 Moriscos. Ferdinand II and Isabella I's conquest ended 700+ years of Islamic rule; forced conversions followed by 1502 in Castile and the 1520s in Aragon, but Islamic cultural legacy in language, architecture, and agriculture remains visible today.