THE ex-wife of “Da Vinci Code” author Dan Brown has sued him for allegedly using large sums of money to cheat on her.

In the lawsuit filed Monday in New Hampshire, Blythe Brown accuses her ex-husband of secretly putting aside money to conduct “sordid, extra-marital affairs.”

The salacious claims include a romp with a horse trainer, according to The Boston Globe.

Dan Brown is best known for writing “The Da Vinci Code” — the novel was released in 2003 and sold 80 million copies.

The couple divorced last December after more than 21 years of marriage, according to the Globe.

Blythe accuses the 56-year-old author of engaging in “unlawful and egregious conduct” that resulted in a proverbial life of lies” during the final years of their marriage — including lavish gifts sent to a Dutch horse trainer, the Globe reported.

She brought the trainer, who is named using the initials JP, from Holland to the U.S. in 2013 to care for a horse the couple owned, the lawsuit claims.

Once their divorce was finalized, Blythe claims that’s when she learned her then-husband had started an affair with JP in 2014, according to the newspaper.

The bestselling author had funneled large sums of money to buy the trainer a US$345,000 prize-winning Friesian horse named “LimiTed Edition,” the report says.

He also allegedly bought JP a new car, a truck, and covered the costs for renovations to her home in Holland, which depleted his marital property, Blythe argued in her filing.

The Globe reported that Blythe confronted her ex-husband in January of this year after learning about the affair.

“I’ve done a lot of bad things with a lot of people,” Dan allegedly told her, admitting he’s also cheated with a local hairdresser, according to the lawsuit.

Blythe claims Dan had a string of conquests with multiple women, who allegedly include his personal trainer and a “political official” at the couple’s vacation home in Anguilla, according to the newspaper.

In her lawsuit, Brown’s scorned ex claims she played a crucial part in his success as his lead researcher.

She said she “developed the premise of the critical concepts, historical emphases, and complex plot twists” for all of his novels — including the “Da Vinci Code,” which was adapted into an eponymous movie starring Tom Hanks.

The 2006 film was a box office smash and grossed more than US$760 million globally.

Dan has often touted Blythe’s significant role in creating his novels, the Globe reported.

His ex-wife moved out of their New Hampshire home in 2018 after he revealed to her he was unhappy and wanted to separate.

In a statement to the Globe, Blythe said it was only after their separation that she learned her ex-husband had been “leading a double life for years.”

She’s suing Dan for allegedly misrepresenting their assets in the divorce and for causing emotional distress.

Meanwhile, Dan told the paper he accurately reported the couple’s assets in their split and was “stunned” by Blythe’s “false claims.” (SD-Agencies)