OXFORD University has followed in the tributes paid to one of the world's most celebrated diplomats Kofi Annan who has died age 80.

The Annan family announced yesterday that the former member of the United Nations, who rose through the ranks to become the first black African secretary-general, passed away after a short, unspecified illness.

Tributes have flooded in from across the world, and in his homeland of Ghana president Nana Akufo-Addo called for a week with flags at half-mast.

He said: "One of our greatest compatriots. Rest in perfect peace, Kofi. You have earned it."

Oxford University has followed in the tributes yesterday retweeting the family's statement, adding: "Kofi Annan visited Oxford only recently and came to the University often to share insight and experience. Deepest condolences."

The most recent visit to Oxford included the Nobel Peace Prize winner taking centre stage to open the Bonavero Institute of Human Rights in June.

The institute, based at The Hands Building at Mansfield College, is part of the university's faculty of law.

A tweet from the institute yesterday said: "Deeply saddened to hear news of the death of #KofiAnnan who graciously agreed to launch of @BonaveroIHR in June and inspired so many with his lifelong work to promote and protect human rights in the world."