question: Who proposed that change was needed in the way business with the Greeks was to be conducted ?
answer: trade until an embargo imposed by the Roman Emperor on trade with the Caliphate
turker_answer: The Roman Emperor proposed to change the way business with the Greeks was to be conducted when he imposed an embargo on trade with the Caliphate .
rule-based: Trade until an embargo imposed by the Roman Emperor on trade with the Caliphate proposed that change was needed in the way business with the Greeks was to be conducted .