A nun — who was part of a #churchtoo social media campaign — claims a priest at a Long Island monastery sexually harassed her and another nun and the sisters were cast out for blowing the whistle, according to a new lawsuit.

Elizabeth Brandenburg, a Greek Orthodox nun who went by Mother Foteini, says that when she was at a religious college in Massachusetts Father Gerasimos Makris forced her to marry a man, who sexually abused her and who had preyed on at least one other student, to “sanctify” the attack in 2004, according to a lawsuit from Wednesday.

Brandenburg says her husband regularly threatened her including by once holding a knife to her neck and another time threatening to “kill [her] and dump [her] body,” the Manhattan Supreme Court lawsuit alleges.

Makris, Brandenburg’s “spiritual father,” only eventually sanctioned her divorce from the man because he wanted her to become a nun at a monastery he would found called All Saints Monastery in Calverton, NY, the court papers say.

But Brandenburg and Maria Kallis, who was known as Sister Theonymphi, for a decade allegedly faced a constant barrage of flirtation and inappropriate touching by Makris. And when they complained they became outcasts in their church and were forced to move to out of state, the court documents say.

They claim Makris found ways to brush his penis against their bodies through clothes, subjected them to unwanted hugs and kisses and regularly flirted with them making Kallis say “I love you” to him like she means it, the court filings allege.

When they spoke out, the church at one point threatened to send them to Greece to become “real nuns” in retaliation, the court papers claim.

And after the women left the state in November 2018, another nun at their monastery spread lies that they stole a car which they had in fact bought with their own money. The claim was investigated by Long Island police who confirmed the car was not stolen, the court papers say.

Makris apologized to the women in 2017 and resumed his post as a priest at Holy Cross Church in Bay Ridge in 2018 after initially being banned from the pulpit amid the allegations.

The Archdiocese, “failed to investigate Plaintiffs Theonymphi and Foteini’s complaints of sexual misconduct and/or harassment against Defendant Makris and intended to return Defendant Makris to a leadership position … without taking any steps to prevent such conduct from happening again,” the court papers charge.

The women moved out of state Nov. 18, 2018, “as they had no other choice given the retaliatory environment they had been experiencing for nearly one year since complaining and because they learned that Defendant Makris would be reinstated to his former position,” the court documents claim.

Bradenburg, 38, and Kallis, 37, now live in Missouri running a company that employs survivors of sex trafficking. Their company, White Field Farms, sells soaps and candles.

“It was confusing that someone who pledged celibacy would be so touchy,” Bradenburg told The Post.

Kallis — who allegedly bore the brunt of Makris’ sexual misconduct — said he grew angry when she rebuffed his advances.

“Over time he would … show extreme anger at me because I pushed him away or tried to voice that I wasn’t comfortable,” Kallis told The Post.

Kallis said the Greek Orthodox Archdiocese of New York — which is named in the suit — needs “to be brought to the mat and be shown you can’t do that when you’re an institution — an institution that claims to be standing for goodness. You should be the first to care for somebody who said ‘I got hurt.'”

“After many years of being sexually harassed and victimized by a Greek Orthodox Priest these sisters have had their worst fears realized and have had the senior clergy of the Greek Orthodox Archdiocese of New York turn them into victims again by blaming and punishing them for the reprehensible behavior of the priest,” their lawyer Eric Baum said.

They are suing for retaliation, defamation, sexual harassment and other claims. The women are seeking unspecified damages.

The Greek Orthodox Archdiocese said it “does not tolerate sexual harassment or workplace harassment. We are confident that justice will be served.”

Makris did not immediately return a request for comment.

In 2018, Makris told The Post, “I never bothered them … I’m saying [the women are] exaggerating things.”