Painter Charlotte Johnson Wahl, the mother of British Prime Minister Boris Johnson, has died aged 79.

Wahl died “suddenly and peacefully” at a London hospital on Monday, according to a death notice in The Times of London.

Boris Johnson once described his mother as the “supreme authority” in his large, close-knit family. She was a successful painter of portraits and landscapes.

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Wahl and first husband Stanley Johnson divorced in 1979. She later married American academic Nicholas Wahl, who died in 1996.

She is survived by four children — the prime minister, journalist Rachel Johnson, former politician Jo Johnson and environmentalist Leo Johnson — and 13 grandchildren.