Vinland
The first reference outside the Sagas is that of Adam of Bremen (1076) in his Gesta Hammaburgensis.  He wrote: "Praeterea unam adhuc insulam recitavit a multis in eo repertam occeano, quae dicitur Winland, eo quod ibi vites sponte nascantur, vinum optimum ferentes. Nam et fruges ibi non seminatas habundare, non fabulosa opinione, sed certa comperimus relatione Danorum." This can be translated as: "In addition [the king of the Danes] reports on one of many islands in the ocean, which is called Winland, because vines grow there wild, which produce wine. That there are fruit in abundance which have non been [planted], we have not known from an incredible rumour, but from the report of the Danes."