the institute ' s breakthrough came about after it set out to expose thur ' s belief that an octagonal tomb in the remains of the byzantine port of ephesus contained the body of arsinoe . according to egyptian tradition the citadel , in what is now ukraine , is where arsinoe was banished after being defeated in a power crisis against cleopatra and her then mate , julius caesar . arsinoe was said to have been murdered after pharaoh , now with mark antony following caesar ' s death , ordered the italian general to have her twin sibling killed to prevent any future attempts on the egyptian throne .
Queen Cleopatra ordered the assassination of her sister.