The song and reading list, which Kensington Palace announced ahead of the ceremony, referenced two important events for Prince Louis’s parents and grandparents. The first of the anthems performed at the service, “This Is the Day Which the Lord Hath Made,” was composed by John Rutter specifically for William and Kate’s 2011 wedding.
In addition, the song they chose for the processional, Prelude on Rhosymedre by Vaughan Williams, was played at their wedding — and Prince Charles‘s and Princess Diana‘s wedding in 1981.
William and Kate, who wore Alexander McQueen for today’s celebration, and Prince Harry and Meghan Markle, often pay tribute to Diana at important family moments. Kate’s engagement ring, for example, was originally Diana’s, and Meghan wore Diana’s famous aquamarine ring at the royal weddingreception. Plus, the flowers inside the chapel where Harry and Meghan tied the knot included white roses, Diana’s favorite, and they had Elton John, a close friend of hers, perform at the reception.
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This article originally appeared on PEOPLE