Bob Peters' highly regarded stayer Regal Power has run his final race.

Regal Power ends his career as an eight-year-old and off the back of 41 starts since his debut at Belmont Park in 2018.

The son of Pierro won 10 races, placed eight times and reached $4.7 million in prizemoney.

Regal Power won his first race at his second start and claimed maiden feature success in the Listed Lex Piper Stakes over 1600m.

Further three-year-old triumphs and a portent of things to come came when he claimed the WA Derby-Melvista Stakes double.

Regal Power reached elite status by winning the Group 1 Railway Stakes and Group 1 Northerly Stakes at Ascot in 2019 and 2021.

His biggest win in terms of prize money was interstate in Melbourne when he won the $5 million All-Star Mile at Caulfield.

Peters, Perth's leviathan owner-breeder, has a racing CV that only a few in the thoroughbred world can match.

In a glowing endorsement of Regal Power, Peters said the gelding sits comfortably among the best horses he's been involved with.

"He kept putting his hand up and showed glimpses of his old form, but he was ready to retire," Peters told Tabradio.

"I would have liked to have sent him out as a winner of a big race.

"He'd be up there with the best I've had, he had to be if you looked at stake money that he had won.

"He's the highest stakes earner that we've ever had, he has to be up there.

"He's been one of the unassuming ones that has come along.

"The time he ran in the WA Derby was unbelievable. That sort of told me that he was up to the big time.

"He proved that when he came back after that."