For 10 points, give this common name of Frankish rulers, including a man known as "the Strong" who was the great grandfather of Hugh Capet.
A man referred to as the fourth ruler by this name hired Vikings for six thousand pounds of silver to attack Salomon's kingdom. However, he was killed when a raiding band of Vikings under their chief Hastein happened upon him after he'd taken off his armor at a stone church in the aftermath of the Battle of Brissarthe. The Count of Hesbaye, and the Count of Wormsgau were part of a line of rulers of this name, and were its second and third heads. A ruler by this name married Béatrice of Vermandois and spent his early life as a loyal servant to his brother, known either as Odo or Eudes. That man became the first king of this name by rebelling against Charles the Simple in 922 CE, and expanding his power base from Austrasia to Neustria. For 10 points, give this common name of Frankish rulers, including a man known as "the Strong" who was the great grandfather of Hugh Capet.
A man referred to as the fourth ruler by this name hired Vikings for six thousand pounds of silver to attack Salomon's kingdom.
Robert [the Robertian House or Robertines, or variations like Rutpert or Rodbert or Robertin or Rupert]