<prompt> Translate the following text to SwahiliIts present form comprises a total of seven concentric rectangular walled courts, culminating in an inner sanctum, and dates from the 15th and 16th centuries, after it had been liberated from Muslim invaders who had previously used it as a fortress.  <response>: Jengo hilo lina vyumba saba vya mviringo, na linatokana na karne ya 15 na 16, baada ya kuachiliwa kutoka kwa wavamizi wa Kiislamu ambao walikuwa wametumia kama ngome. 