I'm not sure if this fits the bill entirely, but it has a nice historic flavor and the writer is excellent. Honey Flower, Apple and Lime by veronamay (http://archiveofourown.org/works/666581/chapters/1217404)

The year is 1855. Jensen is the scion of a wealthy Dallas family, heir to a ranching empire that stretches across the American Southwest. Until now, he has led a life of carefree abandon, charming his way into boudoirs and out of entanglements by dint of his silver-tongued wit. After his father's sudden death, Jensen is sent to London by his stepmother to acquire a wife during the Season. Threatened with disinheritance should he make an unsuitable match, he arrives on the doorstep of his friend Welling's household prepared—reluctantly—to do his duty. Everything changes, however, when he lays eyes upon the Wellings' newest footman. Padalecki is tall, strong, intelligent and beautiful—everything Jensen admires in a man. From the moment they meet, Jensen is willing to risk everything to gain the gorgeous Texan's love. But Padalecki wants nothing to do with Jensen ... or does he?

Sounds good. Thanks.

This is het (Jensen/Danneel), but it's definitely historical, and Jared is Jensen's valet/assistant/stunt coordinator.

https://sarosefics.livejournal.com/58650.html

that is not what I asked for. I never read het.

There is The Winter Manor by GUARD_THE_CARDS
https://cards-fics.livejournal.com/tag/the%20winter%20manor
It is from 2008 and unfinished to my knowledge but it fits your request.