Beyoncé and Jay Z celebrate their 17th year of marriage Friday, and their anniversary date, April 4, is no coincidence.

The power couple chose to get married on the fourth day of the fourth month for a reason. Both Jay and Bey got matching tattoos of the Roman numeral for four — IV — on their ring fingers years ago.

The matching tattoos aren’t just a stamp of admiration for the number. The “On The Run II” singers actually have special ties and a long history with the number in their personal and professional lives.

Beyoncé’s was born Sept. 4, and Jay-Z’s birthday is Dec. 4. Meanwhile, Beyoncé’s mom, Tina Knowles, was born on Jan. 4. Jay and Bey eventually tied the knot on April 4, 2008.

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In addition to their April 4 wedding date, Beyoncé titled her fourth studio album “4” in 2011. The same year, Yoncé released her video album “Live at Roseland: Elements of 4” through Columbia Records and her Parkwood Entertainment company. The album includes a concert film, which was shot during Beyoncé’s four-night concert series in New York.

In the film, she opened up about her personal life, including why it felt destined for her to sing at the inauguration of the first Black president, Barack Obama, in 2009. Beyoncé called the performance one of her biggest accomplishments, pointing out that Obama’s birthday is Aug. 4, similar to her birthday, her mom’s and Jay Z’s. She noted that he was the 44th president.

She broke down the significance of the number while onstage as she performed different songs from her catalogue. While introducing her song “Put a Ring on It,” she said, “on April 4, 2008 — eight divided by two is four — [Jay-Z] put a ring on it.”

Jay- Z later named his 13th studio album “4:44” in June 2017.

Furthermore, Beyoncé and Jay-Z named their first child Blue Ivy Carter. The word “Ivy” refers to the Roman numeral for four, which could’ve been a selling point when choosing their daughter’s name. Additionally, Beyoncé’s former clothing line was titled Ivy Park.

It’s clear the number four is more than just a coincidence — it’s a cornerstone of their love story. Now and fourever, you might say.