To set forth is to begin a journey, or to state something in order. Set forth at dawn.
The journey sense is old-fashioned and the stating sense survives in legal writing. To set forth an argument means laying it out point by point.
1phraseset forthTo begin a journey, or to state something in order.
“The terms are set forth in the second schedule.”
set forth is a phrase.
Practised in A Song of Ice and Fire