I answered their questions 'to the best of my knowledge'. [=I gave the best answers I could based on what I knew, but I might have answered differently if I had known something else]
No one arrived late 'to my knowledge'. [=I am not aware that anyone arrived late, but it is possible that someone arrived late and I don't know about it]
They went on vacation, 'safe in the knowledge' that the farm would be well cared for while they were away.
(..) She was a peasant girl. Pretty in a common sort of way. She was the miller's wife. Apparently they had married without my knowledge or consent. So I had him hanged and I took her beneath the tree where he was swaying. She fought me the whole time. (..)2015 TvShow: Game of Thrones Title: Kill the Boy Season: 5 Episode 5