Anurag Lamba > Status Update

I am reading history of 15th century europe. I have a question for my fellow goodreads members.
" The great northern forest prevented russians from finding a way to the white sea. It was an englishmen who showed them the route in mid 16th century" i wasn't able to search him on on net can anyone tell me his name ?
The effort to reach the sea special ice ftee sea was important objective of Russia from medieval time