sentences:  According to Strabo, Pytheas referred to Britain as "Bretannikē", which is treated a feminine noun.Marcian of Heraclea, in his "Periplus maris exteri", described the island group as (the Prettanic Isles).The Greco-Egyptian scientist Ptolemy referred to the larger island as "great Britain" (μεγάλη Βρεττανία "megale Brettania") and to Ireland as "little Britain" (μικρὰ Βρεττανία "mikra Brettania") in his work "Almagest" (147–148 AD).