It was one of two substantial parts of the Palace of Whitehall to survive a catastrophic fire in January 1698, the other being Inigo Jones's classical Banqueting House.
It was demolished in August 1759 to allow better movement of traffic and was possibly going to be re-erected in Windsor Great Park, but its materials were dispersed instead.
(Three terracotta busts by Pietro Torrigiano owned by the Wright family in Hatfield Peverel until the 1920s were thought to come from the Gate, but later scholarship doubts any connection.)
A gallery to the west overlooked the Royal Tiltyard (now Horse Guards Parade) leading eventually to St James's Park.
Proposals for its demolition were put forward in the early part of the 18th century, but were successfully opposed by John Vanbrugh and others.
[1] There were plans for the Duke of Cumberland to rebuild the gate in Windsor Great Park, but in the end it seems that the materials were incorporated in repairs to other buildings.