Third Pointed or Perpendicular Gothic developed in England from the later 14th century and is typified by Rectilinear tracery (panel-tracery). The mullions are often joined together by transoms and continue up their straight vertical lines to the top of the window's main arch, some branching off into lesser arches, and creating a series of panel-like lights. Perpendicular strove for verticality and dispensed with the Curvilinear style's sinuous lines in favour of unbroken straight mullions from top to bottom, transected by horizontal transoms and bars. Four-centred arches were used in the 15th and 16th centuries to create windows of increasing size with flatter window-heads, often filling the entire wall of the bay between each buttress. The windows were themselves divided into panels of lights topped by pointed arches struck from four centres. The transoms were often topped by miniature crenellations. The windows at King's College Chapel, Cambridge (1446–1515) represent the heights of Perpendicular tracery.
