Gabriel
ancestor
announce
announcer
antecedent
augury
avant-garde
bellwether
buccinator
buccinator novi temporis
bushwhacker
evangel
evangelist
explorer
forebear
foregoer
forerun
forerunner
foreshadower
foreshow
foretoken
front runner
frontiersman
fugleman
give notice
groundbreaker
guide
herald
herald angel
innovator
lead runner
leader
messenger
notify
omen
outrider
pathfinder
pioneer
point
portent
preannounce
precedent
precursor
predecessor
indicant
indication
tell
harbingered
harbingering
harbingers
Harley
bringer
brink
cusp
embodiment
imminence
presentiment