Albert I 'the Tall' Duke of Braunschweig-Lüneburg
- Born: 1236
- Marriage (1): Elizabeth in 1254 in Braunschweig, Braunschweig, Germany
- Marriage (2): Adelheid about 1263
- Died: 1279 at age 43
Albert (Latin Albertus, German Albrecht; 1236 \endash 1279), called the Tall (Latin Longus), was duke of Brunswick-Lüneburg.
Albert was the second son of Otto the Child, Duke of Brunswick-Lüneburg. When his father died in 1252, he was the oldest surviving son, and took over the rule of the duchy; later his younger brother John joined him. In 1267, the brothers agreed to divide the duchy, which happened in 1269. Albert received the southern half, including Calenberg, Helmstedt, the Harz, and Göttingen. The City of Brunswick was to remain common property of the brothers.
Albert was succeeded by his elder three sons; the younger three sons joined the Church.
Albert married Elizabeth, daughter of Henry II, Duke of Brabant, in 1254. Elizabeth died childless in 1261. He then married Adelheid, daughter of Boniface II of Montferrat, around 1263, and they had the following children:
* Henry (ca. 1267-1322)
* Albert (ca. 1268-1318)
* William (ca. 1270-1292)
* Otto (died ca. 1346)
* Matilda, married Henry III, Duke of Silesia-Glogau
* Lothar (died 1335), Grand Master of the Teutonic Order
* Conrad (died 1303)
In 1285 the duchy of Brunswick had been divided between Duke Albert's three sons, whose relations with each other were far from harmonious,. and the lines of Wolfenbuttel, Göttingen and Grubenhagen had been established. The Wolfenbüttel branch died out in 1292, but was refounded in 1345 by Magnus I., a younger member of the Göttingen family; the elder Göttingen branch died out in 1463, and the Grubenhagen branch in 1596. Magnus I.,. duke of Brunswick-Wolfenbüttel from 1345 to 1369, was the ancestor of the later dukes of Brunswick. His grandsons,, Frederick, Bernard and Henry, secured Luneburg in 1388, but in 1428 Bernard, the only survivor of the three, was forced to make a division of the duchy, by which he received Luneburg, while his nephews, William and Henry, obtained Brunswick, which in 1432 they divided into Calenberg and WolfenbUttel. In 1473, however, William, who had added Göttingen to his possessions in 1463, united these lands; but they were again divided from 1495 to 1584. In 1584 Brunswick was united by Duke Julius, and in 1596 Grubenhagen was added to it. Duke Frederick Ulrich, however, was obliged to cede this territory to Luneburg in 1617, and when he died in 1634 his family became extinct, and Brunswick was divided between the two branches. of the Luneburg family.
The duchy of Luneburg, founded by Bernard in 1428, remained undivided until 1520, when Duke Henry abdicated and his three sons divided the duchy. Two of the branches founded at this time soon died out; and in 1569, after the death of Ernest I.,. the representative of the third branch, his two sons agreed upon a partition which is of considerable importance in the history of Brunswick, since it established the lines of Dannenberg and of Luneburg-Celle, and these two families divided the duchy of Brunswick-Wolfenbuttel in 1635. The dukes of Luneburg-Celle subsequently took the name of Hanover, and were the ancestors of the later kings of Hanover (q.v.). After the acquisition of 1635 the family of Dannenberg took the title of Brunswick-Wolfenbüttel, and ruled in the direct line until 1735. It was then followed by the family of Brunswick-Bevern, which had split off from the parent line in 1666 and ruled until 1884.
Albert married Elizabeth, daughter of Henri II Duke of Brabant and Sophie of Thüringen, in 1254 in Braunschweig, Braunschweig, Germany. (Elizabeth was born in 1243 and died on 9 Oct 1261.)
Albert next married Adelheid about 1263. (Adelheid was born about 1240.)