The clandestine practice of Islam continued well into the 16th century. In 1567, King Philip II finally made the use of the Arabic language illegal, and forbade the Islamic religion, dress, and customs, a step which led to the Second Rebellion of Alpujarras, involving acts of brutality. In one incident, troops commanded by Don John of Austria destroyed the town of Galera east of Granada, after slaughtering the entire population. The Moriscos of Granada were rounded up and dispersed across Spain. 'Edicts of Expulsion' for the expulsion of the Moriscos were finally issued by Philip III in 1609 against the remaining Muslims in Spain. The expulsion was particularly efficient in the eastern region of Valencia where they made up 33% of the population and ethnic tensions between Muslim and non-Muslim populations were high. The corresponding expulsion of Muslims from the Kingdom of Castille and Andalusia was officially completed in 1614 although its success has been questioned by modern scholars. Unlike the Kingdom of Aragon and Valencia, Moriscos were highly integrated in the rest of Spain significant number of them avoided expulsion or returned en masse, with the protection of non-morisco neighbours and local authorities.