Hi!

On sharecg, if you search in "3D models" the artist AlKoponen or keppu, you have many possibilities.

And on freebies here, write "medieval". And for architecture, for exemple there is this link: http://www.renderosity.com/mod/freestuff/?search=medieval&branch_category=Poser%3BThemed%3BArchitecture&expression=freestuff_name