What was the religion of the duke of Northumberland and the duke of somerset?

The duke of northumberland and the duke of somerset were protastant.

Or another way to find out is if the king or queen was catholic they were catholic but if the king or queen was protastent they were protastent.

Baisically everyone important in the olden days, I think now but I'm not so sure, was the same religon as the king or queen.