title was not confirmed until 1159, five years after Robert's death. Robert's son Walram I (1154–1198) was the first person to be legally titled Count of Nassau. The chronology of the Counts of Laurenburg is not certain and the link between Robert I and Walram I is especially controversial. Also, some sources consider Gerhard, listed as co-Count of Laurenburg in 1148, to be the son of Robert I's brother, Arnold I. However, Erich Brandenburg in his Die Nachkommen Karls des Großen states that it is most likely that Gerhard was Robert I's son, because Gerard was the name of Beatrix of Limburg's maternal grandfather. Counts of Laurenburg (ca. 1093–1159) and Nassau (1159-1255) In 1255, Henry II's sons, Walram II and Otto I, split the Nassau possessions. The descendants of Walram became known as the Walram Line, which became important in the Countship of Nassau and Luxembourg. The descendants of Otto became known as the Ottonian Line, which would inherit parts of Nassau, France and the Netherlands. Both lines would often themselves be divided over the next few centuries. In 1783, the heads of various branches of the House of Nassau sealed the Nassau Family Pact (Erbverein) to regulate future succession in their states, and to establish a dynastic hierarchy whereby the Prince of Orange-Nassau-Dietz was recognised as President of the House of Nassau. The Walramian Line (1255–1985) The Walramian Line concentrated their efforts primarily on their German lands. The exception was Adolf, King of the Romans (c. 1255 – 2 July 1298) who was the count of Nassau from about 1276 and the elected king of Germany from 1292 until his deposition by the prince-electors in 1298. He was never crowned by the pope, which would have secured him the imperial title. He was the first physically and mentally healthy ruler of the Holy Roman Empire ever to be deposed without a papal excommunication. Adolf died shortly afterwards in the Battle of Göllheim fighting against his successor Albert of Habsburg. He was the second in the succession of so-called count-kings of several rivalling comital houses striving after the Roman-German royal dignity after the expiration the Hohenstaufen. The Nassaus, however, were not on the imperial throne long enough to establish themselves in larger landholdings to increase their hereditary power such as the Luxemburgers did in Bohemia or the Habsburgs did in Austria. After Gerlach's death, the possessions of the Walram line