Who makes the decisions in an aristocratic government

Nobility.

Explanation:

ar·is·toc·ra·cy

/ˌerəˈstäkrəsē/

noun

1.

the highest class in certain societies, especially those holding hereditary titles or offices:

"the ancient Polish aristocracy had hereditary right to elect the king"

a form of government in which power is held by the nobility.

a state governed by the aristocracy.

a group regarded as privileged or superior in a particular sphere:

"high-level technocrats make up a large part of this “technical aristocracy.”"

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.

international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.