Solace

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Middle English: from Old French solas (noun), solacier (verb), based on Latin solari ‘to console’.

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From Old French solas, from Latin sōlācium(“consolation”), root from Proto-Indo-European *sōlh₂-(“mercy, comfort”).

etymonline

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solace (n.)

"comfort in grief, consolation," late 13c., from Old French solaz "pleasure, entertainment, enjoyment; solace, comfort," from Latin solacium "a soothing, assuaging; comfort, consolation," from solatus, past participle of solari "to console, soothe," from a suffixed form of PIE root *selh- "to reconcile" (source also of Greek hilaros). Adjectival form solacious is attested 16c.-17c.

solace (v.)

"comfort, console in grief," late 13c.; also in Middle English "entertain, amuse, please," from Old French solacier "comfort, console" (often with a sexual connotation) and directly from Medieval Latin solatiare "give solace, console" (source also of Spanish solazar, Italian sollazzare), from Latin solacium (see solace (n.)). Related: Solaced; solacing.