He was knighted by the Queen Elizabeth II

During her 68-year reign, the Queen had meetings with most of the presidents (everyone except Lyndon Johnson). Her visits to George H.W. Bush were among the most famous, though. She attended a state dinner and planted a tree at the White House during her 1991 visit to the United States. She attended an Orioles game at Camden Yards in Baltimore during this trip as well.

Additionally, the Queen bestowed a very special honor upon George H. W. Bush. He received a knighthood from Queen Elizabeth II in 1993. He didn't have to bow like an English knight because he is an American. Likewise, he lacks the right to address himself as "Sir." Bush received the highest honorific title awarded by Britain to a foreigner, the Knight Grand Cross of the Most Honorable Order of the Bath, or GCB, together with Ronald Reagan.

Queen published a heartfelt message upon his passing, in which she states: "It was with sadness that I learned of the death of President George H W Bush last night. President Bush was a great friend and ally of the United Kingdom. He was also a patriot, serving his country with honor and distinction in Office and during the Second World War. Prince Philip and I remember our days in Texas in 1991 with great fondness. My thoughts and prayers are with President Bush’s family and the American people.”