The founder of the church was  Theodore Metochites,  prime minister to Emperor Andronicus Palaeologus I.  Theodore Metochites was also an astronomer, poet, theologian and philosopher. Unfortunately he lived a very sad life, after Andronicus was replaced by Andronicus III Palaeologus, he was sent to exile. After he returned to Konstantinople, he devoted himself to the church as a monk and he died there. Early in the 16C, the church was converted into a mosque by Atik Ali Pasha and the mosaics were covered with plaster. Unless you are well informed of Old and the New Testament as well as Byzantine fine art you are advised to take a guide on your tour. 
Be warned:  closed on Wednesdays

Chora Museum
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chora museum