Sir Laurens van der Post became a friend of Charles in 1977; he was dubbed his "spiritual guru" and was godfather to Charles's son, Prince William. From van der Post, Prince Charles developed a focus on philosophy and interest in other religions. Charles expressed his philosophical views in his 2010 book, "", which won a Nautilus Book Award. In October 2019 he attended the canonisation of Cardinal Newman. Charles visited Eastern Church leaders in Jerusalem in January 2020 culminating in an ecumenical service in the Church of the Nativity in Bethlehem, after which he walked through that city accompanied by Christian and Muslim dignitaries.