Haldimand served in the British Army during the Seven Years War and in the American Revolution. In 1778, he succeeded Sir Guy Carleton as Governor-In-Chief of Quebec. He helped settle loyalist refugees and Native American allies settle in Canada. His reluctance to giving in to pressure from the English speaking made him very unpopular with the English.
There’s a lot more to Frederick Haldimand, so I highly recommend reading more about his time in Canada. You can start at The Canadian Biography Online.