Joan Templeman, wife to Virgin Group founder Sir Richard Branson , has died.

She was 80 years old.

“Heartbroken to share that Joan, my wife and partner for 50 years, has passed away,” Branson wrote in a post to Instagram Tuesday.

“She was the most wonderful mum and grandmum our kids and grandkids could have ever wished for.”

The couple was married in 1989 and went on to welcome three children together: Holly, 44, Sam, 30, and Clare Sarah, who died at 4 days old after being born three months premature, according to People .

“She was my best friend, my rock, my guiding light, my world,” Branson wrote in his post.

“Love you forever, Joan.”

Branson, who is said to have a fortune valued at $2.8 billion , met Templeman while she was working at an antique shop in London, and in a

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