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In page Christopher Wren:

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During the 1670s, Christopher Wren received significant secular commissions. Among many of his notable designs at this time, the monument (1671–76)[1] commemorating the Great Fire also involved Robert Hooke, but Wren was in control of the final design, the Royal Observatory (1675–76),[1] and the Wren Library at Trinity College, Cambridge (1676–84)[1] were the most important ones.[citation needed]