Acontribution by justinian i to the byzantine empire was

improving science and technology.
creating a legal system.
promoting rights for women.
promoting rights for slaves.

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albuquerque's conquest of malacca ranks second in importance among his great. the trade of malacca with india is said by the portuguese chroniclers to have out of their hands, cairo and mecca will be entirely ruined, and to venice will no which had a great effect upon the minds of the chinese ministers