Also, I gave him to understand, he gave me to believe, etc.
The situation is not as gloomy as we have been given to believe.
He had been summoned from Rome, and as soon as he docked at Portland, Maine, in early February, he had a request from Cartier to come to Ottawa for discussions. Taché received a copy of the December proclamation of amnesty, which he was given to believe covered every action that had taken place or might take.
give someone to understand (or believe or know)
Inform someone in a rather indirect way.
‘I was given to understand that I had been invited’
give someone to understand (that)
to tell someone something, or to make them think that something is true
She’s been asking to see you, or so I’ve been given to understand.
To tell someone something, or to give information:tell, deliver, report...
(This is given as both British and American usage)