Walking between the trees, Catherine Hamlin approaches with a determined but friendly look on her face. She leans on a walking stick and stops to greet everyone she meets. Hamlin celebrated her 90th birthday this year; the hospital in Addis Ababa that she created with her husband Reginald has also reached a significant milestone, having opened 40 years ago.

In 1959, Hamlin moved from Australia to Ethiopia to start a midwifery school. Just days into her work at the Princess Tsehai Memorial Hospital in Ethiopia’s capital, she and Reginald met a 17-year-old girl with serious post-natal complications.