Late 16th century; earliest use found in George Chapman (?1560–1634), poet and playwright. From well + greave + -ed, after ancient Greek (Homer) ἐϋκνήμις.
Definition of well-greaved in US English:
well-greaved
adjectiveˌwɛlˈɡriːvd
archaic, poetic
Wearing fine or sturdy greaves.
Origin
Late 16th century; earliest use found in George Chapman (?1560–1634), poet and playwright. From well + greave + -ed, after ancient Greek (Homer) ἐϋκνήμις.