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In page Fourth Crusade:

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Constantinople was re-captured by the Nicaeans under Michael VIII Palaiologos in 1261, with naval support from the Genoese in the Reconquest of Constantinople. This led to the restoration of a diminished Byzantine Empire. Commerce with Venice was re-established but the Nicaeans gave their Genoese allies possession of Galata, a fortress on the northern banks of the Golden Horn.[citation needed]