herald (n.)

Old English hergian "make war, lay waste, ravage, plunder," the word used in the Anglo-Saxon Chronicle for what the Vikings did to England, from Proto-Germanic *harjon (source also of Old Frisian urheria "lay waste, ravage, plunder," Old Norse herja "to make a raid, to plunder," Old Saxon and Old High German herion, German verheeren "to destroy, lay waste, devastate"). This is literally "to overrun with an army," from Proto-Germanic *harjan "an armed force" (source also of Old English here, Old Norse herr "crowd, great number; army, troop," Old Saxon and Old Frisian heri, Dutch heir, Old High German har, German Heer, Gothic harjis "a host, army").

The Germanic words come from PIE root *korio- "war" also "war-band, host, army" (source also of Lithuanian karas "war, quarrel," karias "host, army;" Old Church Slavonic kara "strife;" Middle Irish cuire "troop;" Old Persian kara "host, people, army;" Greek koiranos "ruler, leader, commander"). Weakened sense of "worry, goad, harass" is from c. 1400. Related: Harried; harrying.

Old English weldan (Mercian), wieldan, wealdan (West Saxon) "have power over, compel, tame, subdue" (class VII strong verb; past tense weold, past participle gewealden), merged with weak verb wyldan, both from Proto-Germanic *waldan "to rule" (source also of Old Saxon and Gothic waldan, Old Frisian walda "to govern, rule," Old Norse valda "to rule, wield, to cause," Old High German waltan, German walten "to rule, govern").

The Germanic words and cognates in Balto-Slavic (Old Church Slavonic vlado "to rule," vlasti "power," Russian vladeti "to reign, rule, possess, make use of," Lithuanian veldu, veldėti "to rule, possess") probably are from PIE *woldh-, extended form of root *wal- "to be strong, to rule." Related: Wielded; wielding.