monarchs — a hereditary sovereign, as a king, queen, or emperor.
big guns — an influential or important person or thing: He's a big gun in science.
adjective chiefs
mains — a river in central and W Germany, flowing W from the Bohemian Forest in N Bavaria into the Rhine at Mainz. 305 miles (490 km) long.
primaries — first or highest in rank or importance; chief; principal: his primary goals in life.
firsts — being before all others with respect to time, order, rank, importance, etc., used as the ordinal number of one: the first edition; the first vice president.
arches — Obsolete. a person who is preeminent; a chief.