The alliterative poem Sir Gawain and the Green Knight, likely written in the mid to late fourteenth century, survives in a late-fourteenth-century manuscript with three other poems—Pearl, Purity, and Patience—by the same author. Very little is known about the author of these poems, but most scholars believe him to have been a university-trained clerk or the official of a provincial estate (this SparkNote refers to him as the “Pearl-poet” or the “Gawain-poet”). Though it cannot be said with certainty that one person wrote all four poems, some shared characteristics point toward common authorship and also suggest that the Gawain-poet may have written another poem, called St. Erkenwald, that exists in a separate manuscript. All the poems except Sir Gawain and the Green Knight deal with overtly Christian subject matter, and it remains unclear why Sir Gawain, an Arthurian romance, was included in an otherwise religious manuscript.