De Soldanis was born on 1 November 1712 in
Rabat,
Gozo, to Andrea Hagius and Valenzia Sultana. He was baptised in the
Parish Church of St. George the following day. He was born
Giovanni Pietro Francesco Agius, but he later added
de Soldanis to his name, a
Latinized version of his mother's surname Sultana, and he is now commonly known by that name. De Soldanis was privately educated by a
Capuchin friar at the convent of Our Lady of Graces. He later studied literature, philosophy, theology and law at the
Collegium Melitense in
Valletta. De Soldanis was appointed canon of the
Gozo Matrice by Bishop
Paul Alphéran de Bussan in 1729, and he was ordained priest six years later in 1735. De Soldanis was interested in history, culture, archaeology and the Maltese language. He had an extensive library and a
museum in his house, which contained various old coins and medals, inscriptions, pottery and statues. He wrote several manuscripts in a number of languages, including Maltese,
Italian and
French. He published some of his works in
Rome,
Naples,
Venice and
Avignon, but he never published anything in Malta since there was no printing press at the time. De Soldanis' health began to deteriorate in 1768. He died on 30 January 1770, and he was buried at the
Collegiate Parish Church of St Paul's Shipwreck in Valletta. ==Works==