Born to Maha Vidane Mudaliar Gabriel de Sampayo in Colombo on 10 September 1855
Educated at St Benedict's College (former Kottanchina Seminary) before gaining a Queen's scholarship to study at the Colombo Academy (now Royal College, Colombo)
He excelled in school, winning the Form Prize, Prizes for Latin and Maths, and the Turnour Prize
He won the English University Scholarship to the University of Cambridge and study at Clare graduating in 1881 with a LLB
In later years he would name his mansion at Silversmith Street Clareden after Clare College
1881 - called to the Bar from the Middle Temple
On returning to Ceylon he started his legal practice in Colombo. He also served as a lecturer and examiner at the newly established Ceylon Law College, and was co-editor of the Ceylon Law Reports
In 1903 he was sworn in as a King's Counsel and was appointed as a Commissioner of Assize
In 1915 he was appointed a Puisne Justice and was made a senior Puisne Justice in 1922
He functioned as Acting Chief Justice on several occasions
In 1924 was made Knight Bachelor by the King
A devoted Christian, he was the first President of the Catholic Union of Ceylon. The Pope conferred on him the award of Knight Commander in the Holy Order of St. Gregory the Great.