The Queen's husband will return to the UK on Sunday.

BBC: Duke of Edinburgh on three-day visit to Canada

In the wake of the Queen's historic visit to Dublin last year, an official return visit is expected.

BBC: Irish President Michael D Higgins visiting London

He was knighted by Queen Elizabeth II upon his return to England, but continued exploring -- reaching the South Pole by tractor in 1958, joining the first group to climb Antarctica's Mt.

CNN: Everest legend Edmund Hillary dies