 Complete the following phrase:  The Diu Fortress Portuguese: Fortaleza de Diu or formally Fortaleza de São Tomé, is a Portuguese-built fortification located on the west coast of India in Diu. The fortress was built as part of Portuguese Indias defensive fortifications at the eastern tip of the island of Diu during the 16th century. The fortress, which borders on the town of Diu, was built in 1535 subsequent to a defense alliance forged by Bahadur Shah, the Sultan of Gujarat and the Portuguese when Humayun, the Mughal Emperor attempted to annex this territory. It was strengthened over the years, till 1546. The Portuguese ruled over this territory from 1537 until 