In the past before cars were there any laws against riding a horse while drunk?

by Ozymandias1818
Jedimushroom

At least in the UK, yes.

From the licensing act of 1872:

Every person who is drunk while in charge on any highway or other public place of any carriage, horse, cattle, or steam engine, or who is drunk when in possession of any loaded firearms, may be apprehended, and shall be liable to a penalty not exceeding forty shillings, or in the discretion of the court to imprisonment for any term not exceeding one month.

You can read the full text of the act here