The story
- Medieval Latin · derived fromrēgālia“royal powers”
- Middle English · inherited fromregalie
- English todayregalia
From Middle English regalie, from Medieval Latin rēgālia (“royal powers”), substantivisation of the neuter plural of rēgālis (“of a king”), from rēx (“king”). By surface analysis, regal + -ia.
Etymology from Wiktionary, CC BY-SA 4.0.