The term “caucus” originated in the United States, to mean a meeting of supporters of a particular party. This system referred to as “king caucus” was used to nominate presidential candidates during 1800. After 1824, two candidates from the Democratic-Republican Party condemned this system and replaced it with national presidential nominating conventions.
Sultan Suleiman I did not conquer Constantinople. It was Sultan Mehmed II who lead the ottoman during the fall of Constantinople and the Byzantine Empire