 Complete the following phrase:  Cassars date of birth is not known, but he is believed to have been born in around 1520 in either Birgu or Gudja. The Cassar family, probably originating from Sicily, had been established in Malta since at least the year 1440. He had two brothers, named Andreas and Ians, and married his wife Mathia in the early 1560s after which they had five children -two boys, Vittorio and Gabriele; and three girls, Marietta, Battistina and Caterinella. Cassar had another child, Gio Domenico, from an extra-matrimonial relationship which he made sure to inherit none of his will and testament, ironically justifying himself by writing that his son was disobedient. Cassar was initially a capomastro master builder, and he was a pupil of Evangelista Menga, the resident engineer of the Order of St. John. He worked as a military engineer during the 