The entrepreneur did not say what caused her death.
In his post, Sir Richard wrote: “Heartbroken to share that Joan, my wife and partner for 50 years, has passed away.”
He added: “She was my best friend, my rock, my guiding light, my world. Love you forever, Joan x.”
The couple married on Necker island, owned by Sir Richard, in the Caribbean and had three children, Holly, Sam, and Clare Sarah, who died after four days.
In 2018, Holly wrote in a blog that her mother was raised in the centre of Glasgow and worked in a pawnbroker’s shop, and, later, at a London bric-a-brac store in Portobello Road in west London.
She said it was there that her father first fell in love with Lady Branson and “turned up at the shop every day for months, buying stuff he didn’t want or need.”
Holly described her mother as “a stay-at-home mum who was (and still is) always there with a hug, inspiring words of wisdom, and a beautiful, welcoming smile.”
In a blog to celebrate their wedding anniversary five years ago, Sir Richard said he “fell for Joan almost from the moment I saw her”.
“Joan has always been a steady source of wisdom and has played no small part in some of my better life decisions,” he added.
