• Born: Abt 955, Arles, Bouches-Du-Rhone, Provence-Alpes-Cote-d'Azur, France
• Married (1): Before Apr 970
• Married (2): Between 984 and 986
• Died: After 29 Aug 993, Arles, Bouches-Du-Rhone, Provence-Alpes-Cote-d'Azur, France

  Research Notes:

"Boso comes et uxor sua Constantia…illorum filii…Willelmus comes, Rotbaldus comes, Pontius juvenis" signed the charter dated May [963] under which "Gencius et uxor mea Aiburga" donated property "in pago Aquense superiore ad castrum…Ansoyse" to Monmajour. The order of birth of the two older sons of Boson is unclear. The May [963] charter suggests that Guillaume was his older son. However, the name order is reversed inthe charter dated Mar 965 under which "eius filio Rothboldo et fratre eius Wilelmo comite" consented to the charter of "Bosoni comitis, filii Rothboldi quondam", which suggests that Rotbald was older.

Comte de Provence, charters showing that both he and his brother Rotbald were recorded as counts during the same period, although it is not known whether this was a joint countship or whether there was a geographical split between their jurisdictions.

Marquis de Provence. "Vuilelmus marchius Arelatense Provintie" donated property "in comitatu Avinionense, in agro Rupiano, in loco…la Lona" to Saint-Victor, Marseille by charter dated 17 Apr 979, signed by "Arsinda comitissa". "Willelmus comes" donated property to Cluny by charter dated 28 Aug [990] signed by "Rodbaldus comes, Adalaix comitissa, Wilelmus comes et filius eius Wilelmus". "Dominus princeps et marchio istius provinciæ…Willelmus cum coniuge sua…Adelaix et filio suo…Willelmo" restored property to the abbey of Saint-Césaire d´Arles by charter dated 992, subscribed by "Domnus Rotbaldus comes…Willelmus comes filius Rotbaldi et uxor sua Lucia, Wilelmus comes Tolosanus et uxor sua Ema…". ¹