Editor’s note: This article has been updated to accurate note where Pope Leo XIV got his undergraduate degree.

A video of Pope Leo XIV at the 2005 World Series game between the White Sox and the Houston Astros emerged Saturday, confirming his fandom for the Chicago baseball team.

The first American pontiff in history was caught on camera as his face twisted when White Sox closer Bobby Jenks closed out a 5-3 win over the Astros. The footage ends days of speculation about which team Pope Leo XIV has traditionally pulled for. 

“He was never, ever a Cubs fan, so I don’t know where that came from. He was always a Sox fan. Our mother was a Cubs fan,” his brother, John, told WGN News Thursday.

“I don’t know, maybe that clued in there, and our dad was a Cardinals fan, so I don’t know where that all came from.”

The Chicago Cubs-White Sox rivalry has existed for over 100 years.

On Thursday, the Cubs franchise shared an image of a digital board at Wrigley Field that read, “Hey Chicago! He’s a Cubs fan!”

The Sox also shared an image of the board at Rate Field congratulating the new Pope, hailing him as “the South Side’s very own.”

Pope Leo XIV, formerly known as Robert Prevost, is a native of Dolton, Ill., right outside the Chicago city limit. He earned a bachelor’s degree from Villanova University and completed mission work in Peru. 

President Trump, former President Barack Obama and Chicago Mayor Brandon Johnson have congratulated Pope Leo XIV in public posts, wishing him a successful papacy. 

Updated May 11 at 9:06 a.m. EDT