Twiss was born in
Marylebone in London. He was the eldest son of the Rev. Robert Twiss. At
University College, Oxford, he obtained a first-class degree in mathematics and a second in
classics in 1830, and was elected a Fellow of his college, of which he was afterwards successively
bursar,
dean and
tutor. During his connection with Oxford, he was,
inter alia, a public examiner in classics and mathematics,
Drummond Professor of Political Economy (1842), and
Regius Professor of Civil Law (1855). In 1862 he married Marie von Lynnseele. Marriage required him to forfeit his fellowship. In compensation he was elected to an
Honorary Fellowship of University College. He published while at Oxford an epitome of
Niebuhr's
History of Rome, an annotated edition of
Livy and other works, but his studies mainly lay in the direction of political economy, law, chiefly international law, and international politics. He was professor of international law at
King's College London (1852–1855). == Legal career ==