when was windsor castle built

Windsor Castle was first built in the late 11th century, with construction beginning around 1070 and taking about 16 years, so it was largely completed by around 1086.

Quick Scoop: Key Facts

• Initial construction: Started c. 1070, finished after about 16 years (around 1086).

• Who built it: William the Conqueror, shortly after the Norman Conquest of 1066.

• Original design: A wooden motte-and-bailey fortress on a chalk mound, later rebuilt in stone.

• Purpose: To guard the western approach to London and control the Thames corridor, forming part of a defensive ring of Norman castles.

• Later evolution: Extensively rebuilt and expanded in stone from the 12th century onward, especially under Henry II and Edward III.

Why the date is “around” 1070

Medieval records don’t give a single exact “opening day,” but multiple historical timelines agree that William ordered a motte-and-bailey castle at Windsor around 1070, just a few years after 1066. Construction then continued for roughly 16 years, giving the commonly cited completion around 1086.

In everyday terms, if you’re answering “when was Windsor Castle built?”, the historically accurate short answer is: in the late 11th century, begun around 1070 under William the Conqueror and largely complete by about 1086.

TL;DR: Windsor Castle was built in the late 11th century, started around 1070 by William the Conqueror and effectively finished by about 1086.

Information gathered from public forums or data available on the internet and portrayed here.