Otto, duke of Brunswick-Grubenhagen

-https://it.wikipedia.org/wiki/Ottone_IV_di_Brunswick-Grubenhagen

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-http://fmg.ac/Projects/MedLands/BRUNSWICK.htm#Ottodied13981399
b) OTTO von Braunschweig-Grubenhagen ([1320]-Foggia castle [1 Dec 1398/13 May 1399]). Engelhusius’s Genealogia ducum Brunswicensium names “Ottonem, Balthasar et Thomam” as the three sons of “[Dux] Henricus”[227]. Botho’s Chronicon Brunsvicensium Picturatum records that “Hertoghe Otto, Hertoghen Hinrikes sone to Brunswick, ein Here to Embeke unde to dem Grubenhagen” married the Queen of Sicily[228]. He was in the service of his cousin Giovanni II Paleologo Marchese di Monferrato[229], at whose court he lived at Casale with his first wife. Regent of Monferrato 1372 during the minority of Otto [Secondotto] Marchese di Monferrato, who was his godson. His fourth wife awarded him the titles Principe di Tarento and Conte di Acerra in 1376. He was defeated and imprisoned at Altamura by Carlo di Durazzo 26 Aug 1381. Having escaped to Avignon in 1384, he plotted in favour of Louis II Duc d’Anjou but eventually supported King Ladislas. After the death of Charles III King of Sicily, he returned to Naples where he captured the castle of Tarento. He became a supporter of Ladislas King of Sicily in 1388. He was captured and obliged to sell his fief of Acerra to raise money for his ransom[230].

m firstly (1352) as her second husband, VIOLANTE de Vilaragut, widow of don JAIME III King of Mallorca [Arag%C3%B3n], daughter of BERENGUER de Vilaragut & his second wife doña Saura de Mallorca (-before 1372). Vicomtesse d'Omélas 1352/62.

m secondly (Naples Castello Nuevo 25/28 Mar [25 Sep] 1376) as her fourth husband, JEANNE I Queen of Sicily, widow firstly of ANDRÁS Prince of Hungary, secondly of LOUIS di Tarento Duca di Calabria, thirdly of Infante don JAIME de Mallorca titular King of Mallorca [Arag%C3%B3n], daughter of CHARLES of Sicily Duca di Calabria [Anjou-Capet] & his second wife Marie de Valois (Naples [1328]-strangled Castello San Fele/Muro, Basilicate 22 May 1382, bur Naples Santa Chiara).

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https://de.wikipedia.org/wiki/Otto_(Tarent)_

Otto der Tarentiner (* 1319 oder 1320; † 1399 in Foggia) aus der Familie der Welfen war Herzog von Braunschweig-Grubenhagen und nach seiner Heirat mit Johanna I. von Neapel im Jahre 1376 Fürst von Tarent und Graf von Acerra.