to both Filipino Moros from Mindanao, and the moriscos of Granada. Moro refers to all things dark, as in "Moor", moreno, etc. It was also used as a nickname; for instance, the Milanese Duke Ludovico Sforza was called Il Moro because of his dark complexion. In Portugal, mouro (feminine, moura) may refer to supernatural beings known as enchanted moura, where "Moor" implies "alien" and "non-Christian". These beings were siren-like fairies with golden or reddish hair and a fair face. They were believed to have magical properties. From this root, the name moor is applied to unbaptized children, meaning not Christian. In Basque, mairu means moor and also refers to a mythical people. Muslims located in South Asia were distinguished by the Portuguese historians into two groups: Mouros da Terra ("Moors of the Land") and the Mouros da Arabia/Mouros de Meca ("Moors from Arabia/Mecca" or "Paradesi Muslims"). The Mouros da Terra were either descendants of any native convert (mostly from any of the former lower or untouchable castes) to Islam or descendants of a marriage alliance between a Middle Eastern individual and an Indian woman. Within the context of Portuguese colonization, in Sri Lanka (Portuguese Ceylon), Muslims of Arab origin are called Ceylon Moors, not to be confused with "Indian Moors" of Sri Lanka (see Sri Lankan Moors). Sri Lankan Moors (a combination of "Ceylon Moors" and "Indian Moors") make up 12% of the population. The Ceylon Moors (unlike the Indian Moors) are descendants of Arab traders who settled there in the mid-6th century. When the Portuguese arrived in the early 16th century, they labelled all the Muslims in the island as Moors as they saw some of them resembling the Moors in North Africa. The Sri Lankan government continues to identify the Muslims in Sri Lanka as "Sri Lankan Moors", sub-categorised into "Ceylon Moors" and "Indian Moors". The Goan Muslims — a minority community who follow Islam in the western Indian coastal state of Goa — are commonly referred as Moir () by Goan Catholics and Hindus. Moir is derived from the Portuguese word mouro ("Moor"). Moors of the Maghreb In the late 7th and early 8th centuries CE, the Islamic Umayyad Caliphate, established after the death of Muhammad, underwent a period of rapid growth. In 647 CE, 40,000 Arabs forced the Byzantine governor of northern Africa to submit and pay tribute, but failed to permanently occupy the region. After