Liverpool great Steven Gerrard has left Rangers to take over as Aston Villa head coach.
Villa parted ways with Dean Smith on Sunday after a run of five straight Premier League defeats.
Determined to make a swift appointment, it quickly became apparent that Gerrard was Villa's leading candidate, and that move has now been confirmed.
Villa did not announce the length of their new coach's contract, although it is reported to be a two-and-a-half-year deal.
"Aston Villa is a club with a rich history and tradition in English football and I am immensely proud to become its new head coach," Gerrard said.
"In my conversations with Nassef [Sawiris], Wes [Edens] and the rest of the board, it was apparent how ambitious their plans are for the club and I am looking forward to helping them achieve their aims.
"I would like to express my sincere gratitude to everybody associated with Glasgow Rangers for giving me the opportunity to manage such an iconic football club.
"Helping them secure a record-breaking 55th league title will always hold a special place in my heart. I would like to wish the players, staff and supporters the very best for the future."
The former Liverpool and England midfielder, who also played for LA Galaxy, was handed his first senior job in management when he took over at Ibrox in 2018.
Gerrard guided Rangers to second in each of his first two seasons, before they cruised to the Scottish Premiership title last term.
Rangers' success was their first in a decade and ended Celtic's hopes of a 10th consecutive crown.
The Gers are four points clear at the top of the Premiership and still in contention to make the Europa League knockout stage, but Gerrard has decided to swap Glasgow for Birmingham.
Villa have won just three league games this season and sit 16th, having sold talisman Jack Grealish to Manchester City for £100million.
Leon Bailey, Danny Ings and Emiliano Buendia were brought in to help replace Grealish, but fitness issues have meant the attacking trio have rarely featured together so far.
Villa nevertheless have a strong squad, and Gerrard will be hoping to push for Europe in his first venture into Premier League management.
"It has been very clear in our discussions with him that Steven's coaching ambitions, philosophy and values entirely match those of Aston Villa," Villa CEO Christian Purslow said.
Gerrard's first reunion with Liverpool will come on December 11, when Villa visit Anfield, while his first game in charge will be against Brighton and Hove Albion after the international break.