Whether you believe in astrology or not, you've probably believed in a Leo at some point in your life. Those born under this sign tend to be proud, persuasive, confident, and self-assured (-absorbed, -involved, -obsessed, etc., depending on the Leo) and, fortunately for them, are often blessed with that much envied and highly valued physical asset, great hair—much like the "king of the jungle" with his glorious mane. Barack Obama is a Leo; so is Madonna. Some folks regard Leos as highly developed creatures, while others would say their egos are frankly over developed. Wikipedia puts it with a certain even-handed bluntness: "They are known to have plenty of worshipers, but also many hidden enemies, and they are normally recognized by their self-absorbed personalit[ies] and their big ego[s]." Leos are generally considered most compatible with the other two Fire signs, Aries and Sagittarius, and least so with the Earth and Water signs. We found 24 instances of Devleo* in OhioLINK and 367 in WorldCat.
(Drawing of the constellation Leo by John Hevelius, 1690, from Wikimedia Commons.)