Background
Mercieca was born in Victoria on the island of Gozo on 11 July 1878.
Mercieca was born in Victoria on the island of Gozo on 11 July 1878.
In October 1894 he enrolled at the University of Malta and graduated as a lawyer in August 1901.
He was given primary and secondary education at the Sacred Heart Seminary in Victoria. He pursued further studies via scholarships in London and Rome (1902–1903), and started to practise his profession in 1903. In 1921, he founded the Comitato Permanente Universitario, later known as Kunsill Studenti Universitarji (University Students’ Council), the Maltese national student union and the oldest organization of its kind in Europe.
At the start of the 20th century, he was closely involved with various organizations with a pro-Italian stance such as Giovine Malta, Malta Letteraria, and Associazione Politica Maltese.
Rising concern in the mid-1930s about possible Italian espionage activities in Malta gave rise to significant British counter-espionage activity, including the 1936 expulsion of the Italian Consul General. In 1935, Major Bertram Ede, one of Vernon Kell"s MI5 operatives "reported adversely on the pro-Italian sympathies of the Chief Justice, Sir Arturo Mercieca, but although these led to Mercieca"s arrest and detention in Uganda during the Second World War, no action was taken against him in 1935".
In 1937, Sir Charles Bonham-Carter, Governor of Malta, "wished to remove, who made no secret of his pro-Italian sympathies, but Ormsby-Gore, the Colonial Secretary declined to accept this recommendation". On 11 June 1940, the day after Italy declared war on Britain and France, aircraft of the Italian Royal Air Force (Regia Aeronautica) attacked Malta.
Mercieca was compelled to resign the Chief Justiceship to avoid removal and was among those for whom the Governor issued detention orders under the terms of the Malta Defence Regulations.
Their exile in Uganda lasted until early 1945. He died in 1969, aged 91.