Well, the Catholic Encyclopedia is not always right. I suppose those extra-Biblical sources would be worth investigating, whatever they are.
Check out ‘Glastonbury’ for the New Testament times missionary work of Joseph and company. The ‘legends’ of Jesus taking his family to Europe to live out their lives is baloney, but there is solid evidence that Joseph—who had mining interests in Southwestern England, in Tin and Lead—did indeed go there at the behest of Philip, to establish the first above-ground Christian Church. Of course the Roman Catholic Church downplays this because it would mean the Romish claims are specious ot some extent.