Starting in the northeast corner at E staircase, in which Isaac Newton had his rooms, and moving clockwise, one first reaches the Porters' Lodge and Great Gate, begun in 1490 as the entrance to King's Hall and completed in 1535.
The fourth side begins with staircases A-C, before reaching King's Gate (also called Edward III Gateway), and the entrance to the oldest part of the college, the remaining surviving buildings of King's Hall.