Ambiguity of color is characteristic of Pluto. Although both he and his realm are regularly described as dark, black, or gloomy, the god himself is sometimes seen as pale or having a pallor. Martianus Capella (5th century) describes him as both "growing pale in shadow, a fugitive from light" and actively "shedding darkness in the gloom of Tartarean night," crowned with a wreath made of ebony as suitable for the kingdom he governs. The horses of Pluto are usually black, but Ovid describes them as "sky-colored" ("caeruleus", from "caelum", "sky"), which might be blue, greenish-blue, or dark blue.