Passage: In 842 the former duchy was resurrected by the Franks to be held as a Frankish border territory by a dependent margrave. Among the more outstanding of the Frankish dukes, Guido I divided the duchy between his two sons Lambert and Guido II, who received as his share the lordship of Camerino, which was made a duchy. Lambert was a doughty fighter against Saracen raiders, but who equally massacred Byzantines (as in 867), and was deposed in 871, restored in 876, and finally excommunicated by Pope John VIII. In 883 Guido II reunited the dukedom, henceforth as the Duchy of Spoleto and Camerino. After the death of Charles the Fat in 888, Guido had himself crowned Roman Emperor and King of Italy by Pope Stephen V (891). The following year Pope Formosus crowned Guido's son Lambert II as duke, king and emperor.

Question: What were the names of the two sons in which there were divisions?
Lambert and Guido II