Russell Crowe’s ancestor Simon, Lord Lovat got the axe.

The Scottish Jacobite was the last person to be beheaded in England, in 1747 — and the Oscar winner, 59, is apparently his descendant.

Crowe took to X (formerly Twitter) on Wednesday to reveal that he’s related to the late, great chief of Clan Fraser of Lovat, who was executed for high treason in the 18th century.

The “Beautiful Mind” star added that he had “been on the hunt to track down my Italian forebears” for a while now and has been researching his linage, which has led him down “a number of wrong tracks.”

He explained that his great-great-great grandfather on his mother’s side was one Luigi Ghezzi.

Ghezzi, who at one point worked in Argentina, later left on a ship bound to India. However, the vessel was wrecked along the way, and Ghezzi ended up in Cape Town, South Africa.

While there, Ghezzi married Mary Ann Curtain, and together, in 1864, they immigrated to New Zealand.

“Also something else that has recently come to light on my father’s mother’s side, via John (Jock) Fraser (arrived in NZ in 1841) we directly connect back to Simon Fraser, 11th Lord Lovat,” the “Man of Steel” actor noted.

“Look him up. He’s quite the character. The ‘Old Fox’ they used to call him,” he explained.

Lovat was put to death at age 80 in the infamous Tower of London.

He was killed for his involvement with Charles Edward Stuart, or “Bonnie Prince Charlie,” during the 1745 Jacobite rising — a rebellion Stuart mounted in a failed attempt to take the British throne, which he claimed to be rightful heir to.

Simon, Lord Lovat reportedly laughed on the way to his execution, giving rise to the phrase “laughing his head off.”

Crowe’s parentage includes Māori, Scottish, English, German, Irish, Italian, Norwegian and Swedish bloodlines.

He added that he still doesn’t know whom he gets his Irish ancestry from.

The Kiwi-born entertainer continued: “How about this for weirdness, too. In my mother’s family, three generations apart, women married men called Crowe.”

Additionally, he’s been approached by people who tell him that they are related in some way.

“I’ve been a little dismissive thinking I knew every Crowe family member, but I’m also related to another line of Crowes who appear to have been in Australia very early on. Fascinating,” he wrote.

“It’s so cool to finally find out the Italian connection, and that as much of Italy as I’ve seen, it’s to places I’ve never been. Looks like there’s an adventure ahead.”