This port city was valuable and was frequently transferred from one power to another due to its strategic position.
Editors. "Portuguese sack Mombasa after its refusal to pay tribute". The Literary Encyclopedia. First published 01 March 2010; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=9867, accessed 18 April 2015.]