Sir Otto Moses Jaffe, JP (13 August 1846 – 29 April 1929), also spelt Jaffé, was a German-born British businessman, who was twice elected Lord Mayor of Belfast and was a leader of the Jewish community in the city. Family Jaffe was born in Hamburg to the Jaffe family, one of four boys and five girls born to Daniel Joseph and Frederiké Jaffe. In 1852, his parents brought their family to Belfast. Daniel Jaffe along with his older sons, Martin, John and Alfred, set up a business exporting linen. Otto was educated at Mr Tate's school in Holywood, County Down, and later in Hamburg and Switzerland. Marriage Otto Jaffe married Paula Hertz, daughter of Moritz Hertz from Braunschweig on 8 March 1879. They had two sons, Arthur Daniel and William Edward Berthold Jaffe. Daniel Joseph Jaffé was his nephew, son of his brother Martin. Commerce From 1867 to 1877 he lived and worked in New York. In 1877, his brothers retired, so he returned to Belfast to head the family business, "The Jaffe Brothers" at Bedford Street. He built it up to become the largest linen exporter in Ireland. He was a member of the Belfast Harbour Commission. He became a naturalised citizen in 1888. In 1894, he successfully agitated for the reporting and destruction of derelicts in the North Atlantic Ocean. He was a Justice of the Peace, a governor of the Royal Hospital, a member of the Irish Technical Education Board and a member of the Senate of Queen's College, which later became Queen's University of Belfast. He was the German consul in Belfast. He was an active member of the committee which got the Public Libraries Act extended to Belfast, leading to the first free library being established there. In 1910 he erected the Jaffe Spinning Mill on the Newtownards Road, also known as Strand Spinning. This provided work for 350 people, rising to 650 in 1914 when the company expanded to make munitions. He was lavishly charitable and contributed to Queen's College. Religion Otto Jaffe took a keen interest in the Jewish community of Belfast. He was life-president of the Belfast Hebrew Congregation, which worshipped at the Great Victoria Street, Belfast synagogue. His father established it on 7 July 1871. Between 1871 and 1903 this congregation increased from fifty-five to over a thousand. He paid most of the £4,000 cost of building the synagogue in Annesley