The first appears to be ongēan "against, opposite".
Против него поднялся мятеж во главе с Тунни, рабом
The name Ongentheow
Ну судя по моей цитате, этот name ему явно не мама дала.
Почему "снова", если "против"?
В качестве части композита у ongēan- больше значений: "towards, opposite, against, back, again, anew".
Ну так сражался-то он против раба. Рабом вроде не становился, тем более "снова".
In the Old English epic poem Beowulf, Ongentheow is described as a fearsome warrior, and it took two Geatish warriors Eofor and Wulf Wonreding to take him down.The epic tells that the Geats under their new king Hæþcyn captured the Swedish queen, but old king Ongenþeow saved her, at a hill fort called Hrefnesholt, although they lost her gold. Ongenþeow killed Hæþcyn, and besieged the Geats at Hrefnesholt. The Geats were, however, rescued by Hygelac, Hæþcyn's brother, who arrived the next day with reinforcements. Having lost the battle, but rescued his queen, Ongenþeow and his warriors returned home.However, the war was not over. Hygelac, the new king of the Geats, attacked the Swedes. The Geatish warriors Eofor and Wulf fought together against the hoary king Ongenþeow. Wulf hit Ongentheow's head with his sword so that the old king bled over his hair, but the king hit back and wounded Wulf. Then, Eofor retaliated by cutting through the Swedish king's shield and through his helmet, giving Ongentheow a death-blow. Eofor took the Swedish king's helmet, sword and mail and carried them to Hygelac. When they came home, Eofor and Wulf were richly rewarded, and Eofor was given Hygelac's daughter. Because of this battle, Hygelac is referred to as Ongentheow's slayer.WidsithOngentheow is also mentioned in passing by the earlier poem Widsith as the king of Sweden:lines 30–33:Wald Woingum, Wod þyringum, Wald [ruled] the Woings, Wod the Thuringians,Sæferð Sycgum, Sweom Ongendþeow, Saeferth the Sycgs, the Swedes Ongendtheow,Sceafthere Ymbrum, Sceafa Longbeardum Sceafthere the Ymbers, Sceafa the Lombards,
Ecgþēow (pronounced [ˈedʒðeːow]), Edgetho (Proto-Norse *Agiþewaz), or Ecgtheow is a character in the Anglo-Saxon epic Beowulf. He is not mentioned outside the Bēowulf manuscript, and it is not known whether he was based on a real person. He belonged to a probably Swedish family (an ätt, see Norse clans) called the Waegmundings. He married the daughter of Hreðel, king of the Geats, and was the father of Bēowulf.His name could be read as eċġ + þēow, "edge-servant" (that is, sword-thane); alternatively, if his name was a compound of the ancient bahuvrihi type as were many other Germanic heroic names, it would indicate proficiency with the sword, meaning literally, "whose servant is the sword".
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