Among the first was a Richmond cartoonist (thought to be David Strother) who in 1863 published this cartoon of Abraham Lincoln.
Strother was a little classier than Telnaes as he pictured Lincoln himself as the monkey.
Modern cartoonist Telnaes slips lower in making the little five and seven year old daughters of Ted Cruz monkeys.
As far as I know no Civil War political cartoonist pictured Lincoln's children as monkeys--not even in the darkest days of the Confederacy. They had a dash of decency.