Henry II, Count of Nassau

In the politics of the Holy Roman Empire, Henry was generally a loyal supporter of the Hohenstaufen emperors. However, between 1209 and 1211, he backed the rival Otto IV of Brunswick as emperor, before reverting sides to support Frederick II. Between 1212 and 1214, he held prisoner Frederick's (and his own) opponent, Archbishop Theodoric II of Trier.[5] Henry was in 1214 with Emperor Frederick II in Jülich, in 1223 with Frederick's son Henry in Worms, and in 1224 in Frankfurt.[3] In 1228 Henry took part in the Sixth Crusade of Emperor Frederick II.[6] In 1231 Henry attended the Imperial Diet of Worms and in 1232 he was at the imperial assembly of Frederick II in Ravenna.[2]

Later, however, Henry transferred to the papal camp, so that Frederick's son Conrad IV issued an execution order against him in 1241, about the success of which nothing is known.[3] In 1247 Henry supported the election of Anti-King William II of Holland, who confirmed all Henry's imperial possessions and gave him the right to mint coins.[5]

Henry's father had received the Königshof Wiesbaden from Emperor Frederick I in reward for his support of the emperor in the conflicts of 1170–1180.[7][8] The Nassau possessions in this area were expanded around 1214 when Henry received the Imperial Vogtship (Reichsvogtei) over Wiesbaden and the surrounding Königssondergau, which he held as fiefdoms.[5]

About the year 1200, Henry, together with his brother Rupert, began building Sonnenberg on a spur of Spitzkippel peak in the Taunus above Wiesbaden. This was intended for protection against the Archbishop of Mainz and its vassals, the Lords of Eppstein, who held the lands bordering Wiesbaden. However, the cathedral chapter of St. Martin's Cathedral in Mainz claimed Sonnenberg as their own. To settle the dispute, Nassau paid 30 Marks to the cathedral chapter in 1221 to acquire the land of Sonnenberg Castle. They were also forced to recognize the sovereignty of the Archbishops of Mainz over Sonnenberg, taking the castle as a fief of Mainz.[9]

Towards the end of the 12th century, Walram I had been able to strengthen his power on the lower Lahn. As part of the inheritance of the Counts of Arnstein, he succeeded them as the Archbishopric of Trier's Vogt in Koblenz, Pfaffendorf (now a borough of Koblenz), Niederlahnstein, and Humbach (Montabaur). However, by the 1230s, Trier's influence near the Rhine and Lahn had strengthened enough to oust Nassau from the majority of the Archbishopric's vogtships.[7] The Archbishop had reinforced Montabaur around 1217 in order to protect his possessions on the right bank of the Rhine from Nassau.

In 1224, Henry found support from Engelbert II, the Archbishop of Cologne, who made Henry his Hofmarschall and Schenk (an honorary title that originally meant "cup-bearer").[5] However, in exchange for his protection from the Archbishops of Mainz and Trier, Henry had to cede half of Siegen to Cologne. Unaffected by this division of rule, however, Nassau retained its sovereign rights in Siegerland (the region surrounding Siegen), where the important High Jurisdiction (hohe Gerichtsbarkeit) and Hunting Ban (Wildbann) explicitly survived to 1259.[7]

During his reign, Henry fought out numerous feuds, especially with the nobles von Willnsdorf over Siegen, and von Merenberg over the Landgericht Rucheslo in the old Erdehegaue.[3] In the Siegerland, Henry built Ginsburg Castle during his reign.[4][10]

Henry's brother, Rupert, had joined the Teutonic Order in 1230. On his death in 1239, Rupert bequeathed his legacy to the Order. Henry continuously disputed any division of his realm with the Teutonic Order.

Henry also held the Upper Vogtship over the Diocese of St. George in Limburg an der Lahn during the construction of the Limburg Cathedral. In 1239 he transferred, at the request of his vassal Friedrich vom Hain, the income of the Netphen parishes to the Premonstratensian Keppel Abbey near Hilchenbach. His descendants took over the patronage of the monastery.[11]

Henry's policies in the Herborner Mark angered the local aristocratic families. Around 1240, Henry built Dillenburg Castle[2] to better subjugate the dissidents. By 1248, the century-long Dernbacher Feud had already begun, involving Hesse as well in the context of the War of the Thuringian Succession, because of a feud started by Henry with Sophia of Thuringia and her son Henry I "the Child" of Hesse over the Herborner Mark, which burdened the Nassau-Hessian relationships beyond his death for centuries.

The necrology of Arnstein Abbey documented the death of ‘Henrici comitis de Nassauwe, qui contulit nobis ecclesiam in Diffenbach inferiori ...’ on 26 April.[1] Henry is still mentioned in a charter from 1247 and is listed as deceased in a charter from 25 January 1251. This means that he died on 26 April in either 1247, 1248, 1249 or 1250. He was succeeded by his sons Walram II and Otto I.