Bombaim. Subsequently, the towns of Thana, Bandora, Mahim and Bombay were brought under Portuguese control. In 1531, António de Saldanha while returning from Gujarat to Goa, set fire to Baçaim again — to punish Sultanate of Gujarat king Bahadur Shah for not ceding Diu. In 1533, Diogo (Heytor) de Sylveira, burnt the entire sea coast from Bandora, Thana, Baçaim, to Surat. Diogo de Sylveira returned to Goa with 4000 slaves and spoils. For the Portuguese, Diu was an important island to protect their trade, which they had to capture. While devising the means to capture Diu, Portuguese governor of India Nuno da Cunha found out that the governor of Diu was Malik Ayaz whose son Malik Tokan was fortifying Baçaim with 14,000 men. Nuno da Cunha saw this fortification as a threat. He assembled a fleet of 150 ships with 4000 men and sailed to Baçaim. Upon seeing such a formidable naval power, Malik Tokan made overtures of peace to Nuno da Cunha. The peace overtures were rejected. Malik Tokan had no option but to fight the Portuguese. The Portuguese landed north of the Baçaim and invaded the fortification. Even though the Portuguese were numerically insignificant, they fought with skill and valor killing off most of the enemy soldiers while losing only a handful of their own. On 23 December 1534, the Sultan of Gujarat Bahadur Shah, signed a treaty with the Portuguese and ceded Baçaim with its dependencies of Salsette, Bombaim (Bombay), Parel, Vadala, Siao (Sion), Vorli (Worli), Mazagao (Mazgao), Thana, Bandra, Mahim, and Caranja (Uran). In 1536, Nuno da Cunha appointed his brother-in-law Garcia de Sá as the first Captain/Governor of Baçaim. The first corner stone for the Fort was laid by António Galvão. In 1548, the Governorship of Baçaim was passed on to Jorge Cabral. Treaty of Vasai (1534) The Treaty of Vasai (1534) was signed by Sultan Bahadur of Gujarat and the Kingdom of Portugal on 23 December 1534, while on board the galleon São Mateus. Based on the terms of the agreement, the Portuguese Empire gained control of the city of Vasai (Bassein), as well as its territories, islands, and seas. The Bombay islands under Portuguese control include Colaba, Old Woman's Island, Mumbai (Bombay), Mazagaon, Worli, Matunga, Mahim. Salsette, Diu, Trombay& Chaul were other territories controlled and settled by the Portuguese. At the time, the cession of Mumbai (Bombay) was of minor importance, but retroactively