Weeks after the twins were born, Beyoncé and Jay-Z finally confirmed the newborn’s names via a bombshell Instagram post on Bey’s account. The Grammy Award winning singer posted the photo on with the caption, “Sir Carter and Rumi 1 month today.” In the pic, a veiled Beyoncé holds the twins in front of myriad flowers in a garden.

Sir Carter and Rumi 1 month today. 🙏🏽❤️👨🏽👩🏽👧🏽👶🏾👶🏾

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While “Sir” may call to mind a wide range of knights in armor, the name Rumi summons just one individual from history: Jalal ad-din Rumi, a 13th-century Persian poet whose work has remained beloved for hundreds of years. And, as it turns out, if the life of that original Rumi is any indication, the name is an appropriate one for a child in such a musical family.

Rumi was a follower of Sufism, a mystical Islamic movement, and believed that the world was a “tomb” that separated the soul from the divine. He taught followers (dervishes, a word that meant “beggars”) that to release this “imprisoned spirit,” they should dance with “reed flutes, drums, and tambourines,” as TIME reported in a 1972 review of a performance by disciples of the movement at the Brooklyn Academy of Music. Through music and movement, they connected the spiritual world to the world of mankind.

😁🇺🇸

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Last month, People reported that the names were uncovered in trademark documents filed to the United States Patent and Trademark Office. TMZ also confirmed that the trademark documents had been filed, noting that the same company filed similar papers on behalf of Blue Ivy earlier in the year.

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