A person who writes or composes pastoral poetry or bucolic works celebrating rural life and nature.
From Greek 'bukolikos' (relating to cowherd) combined with '-ast' (one who practices). The Greek root 'bouklos' means cowherd, and the suffix became common in English for artistic practitioners.
Bucoliastes were actually a specific category of ancient Greek poets who followed Theocritus—they weren't just writing about shepherds for fun, but were part of an entire literary movement that romanticized country life during urban expansion in the Hellenistic period.
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