Here are some historical romances that are on free promo. I haven't read any of them so can't say if they are any good or not, but they're free.
I linked to Amazon but likely they are free everywhere as they are publisher's promos. I'm being too lazy to list authors.
A Woman Called Sage
Daughter of Joy: Brides of Culdee Creek
Love on a Dime
The Apothecary's Daughter