In PerpendicularGlossary Term traceryGlossary Term, current from the the mid C14 to the early C16, the principal mullions generally continue to the head of the archGlossary Term, creating long rectangular divisions in the upper lights.

• See how a PerpendicularGlossary Term window is composed

The new style probably developed first in London. It appears at Gloucester from c.1330, where the RomanesqueGlossary Term abbey (later cathedral) was remodelled after the burial there of King Edward II.

In the 15th century, windows often had archGlossary Term heads of flattened or four-centred form, accentuating the angularity of the style.

Large PerpendicularGlossary Term windows were inserted in many older churches during the 15th century, and some parish churches, especially those in prosperous towns, were entirely rebuilt in this period.

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Interactive - Perpendicular Tracery