Albrecht I. der Große Welf von Braunschweig-Lüneburg, Herzog von Braunschweig und Lüneburg, was born 1236 to Otto von Braunschweig-Lüneburg (c1204-1252) and Mechthild von Brandenburg (c1210-1261) and died 15 August 1279 Braunschweig, Lower Saxony, Germany of unspecified causes. He married Elisabeth van Brabant (1243-1261) 13 July 1254 JL in Braunschweig, Lower Saxony, Germany. He married Alessia del Monferrato (c1237-1285) 1 November 1263 JL in Kenilworth.
Children
| Name | Birth | Death | Joined with |
| Heinrich I. von Braunschweig-Grubenhagen (1267-1322) | August 1267 | 7 September 1322 Salzderhelden | Agnes von Thüringen (bef1264-aft1332) |
| Albrecht II. von Braunschweig-Wolfenbüttel-Göttingen (c1268-1318) | 1268 | 22 September 1318 | Rixa von Werle (c1268-1317) |
| Wilhelm von Braunschweig-Lüneburg (1270-1292) | |||
| Otto von Braunschweig-Lüneburg (?-c1346) | |||
| Luther von Braunschweig-Lüneburg (1275-1335) | |||
| Mechthild von Braunschweig-Lüneburg (c1275-1318) | 1275 | 1318 | Henry III of Glogow (c1255-1309) |
| Conrad von Braunschweig-Lüneburg (?-c1303) | |||
Footnotes (including sources)
| ‡ General |
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