That is bigamy.
Having multiple wives - whether as a Sultan or otherwise - is known as polygamy.A word which particularly applies to the Middle East is harem - the part of a Muslim household reserved for wives and concubines. By extension this word came to be applied to the wives and concubines as a group.
Having two wives at one time is "bigamy" (illegal in the US, but common in some societies). The general word for having more than one wife is polygamy.
Gubernatorial is a word that means having to do with a governor.
It means having to do with excretion.
Spanish word for wives is "esposas"
A Word to the Wives was created in 1955.
regarding
"Expertise" is a word that means having specialized knowledge in a specific field or subject.
The word "wives" has one syllable.
Costal. This word should not be confused with "coastal" which means on the coast.
"Vigor" is a word that means having a lot of energy or enthusiasm.
Military