I am currently building my own kingdom, but I have a problem. Other factions are constantly attacking me without even declaring war. I would just be minding my own business one day and then somebody from another faction would suddenly start looting my villages or even besieging a castle/town. Even after I send an emissary to enter into a truce, they would just start attacking me again (while the truce is still in place, I might add) after a few days. When I check the faction relations chart, their relation with me is just -1 or -2, not a full -30 like it would be if they'd actually declared war. I thought it was because they don't recognize me as monarch yet, but then today I got attacked by a faction that I had recognition from, in the same fashion.
My right to rule, renown and honor are all quite high at this time, by the way.