Peter Thiel got married in Vienna this past weekend, Axios has learned. Guests came expecting to celebrate the billionaire venture capitalist's 50th birthday, but instead were surprised by a wedding to longtime boyfriend Matt Danzeisen.

Thiel, who was an early investor in Facebook and a co-founder of PayPal, endorsed Donald Trump during the campaign and has been a rare voice of support for the president in Silicon Valley. Thiel's spokesman declined to comment for this story.