Gabriel
Mahdi
advertisement
advertiser
ancestor
announcement
announcer
antecedent
augury
author
avant-garde
bell cow
bell mare
bellwether
born leader
buccinator
buccinator novi temporis
bushwhacker
charismatic leader
choirmaster
choragus
coach
conductor
coryphaeus
duce
envoy
evangel
evangelist
example
exemplar
explorer
file leader
forebear
forefather
foregoer
foreshadow
foreshadower
foretoken
forewarning
front runner
frontiersman
fugleman
groundbreaker
guide
harbinger
herald
herald angel
initiator
indicant
indication
temporal relation
aftermath
portent
precursor
presentiment
verge