pre-, prae-
(Latin: before [both in time and place])
The prefix prae- can actually be substituted for pre- because both of them are different spellings for the same prefix meaning "before".
Related before-word units: ante-; antero-; anti-; pro-.
Related "time" units: aevum, evum; archaeo-, archeo-; Calendars; chrono-; horo-; Quotes: Time; tempo-.