Portuguese ironclad Vasco da Gama armored belt that was thick on either end and thick amidships. The main battery guns were protected by thick barbettes. "Vasco da Gama" was laid down at the Thames Iron Works shipyard in London, Britain in 1875, and was launched on 1 December 1876. The ship was completed in 1878. She served as part of the coastal defense force that protected Lisbon, the Portuguese capital, and the mouth of the river Tagus. On 26 June 1897, "Vasco da Gama" participated in the Fleet Review at Spithead celebrating Queen Victoria's Diamond Jubilee. At the time, the ship was commanded by Captain
Vasco da Gama of five sons of Estêvão da Gama and Isabel Sodré – in (probable) order of age: Paulo da Gama, João Sodré, Vasco da Gama, Pedro da Gama and Aires da Gama. Vasco also had one known sister, Teresa da Gama (who married Lopo Mendes de Vasconcelos). Little is known of da Gama's early life. The Portuguese historian Teixeira de Aragão suggests that he studied at the inland town of Évora, which is where he may have learned mathematics and navigation. It has been claimed that he studied under Abraham Zacuto, an astrologer and astronomer, but da Gama's biographer Subrahmanyam thinks