Dietrich (11th century), Count of Plötzkau', son of Bernhard I von Kakelingen, Count of

Harzgau The Harzgau was a medieval shire ('' Gau'') in the northeastern foorhils of the Harz mountains, part of the Eastphalia region of Saxony. It included the towns of Halberstadt, Quedlinburg, and Osterwieck, and was bounded by the Oker in the west, b ...

and his wife Ida of Querfurt. Little is known about Dietrich or his ancestors other than their familial relations. Dietrich was the brother of

Gebhard of Supplinburg Gebhard of Supplinburg (or ''Süpplingenburg''; died 9 June 1075) was a Saxon count in the Eastphalian Harzgau and Nordthüringgau. He was the father of Emperor Lothair II. Life Gebhard was the son of Count Bernhard of Supplinburg (d. about 1069) ...

, a Saxon count, who was the father of

Lothair II, Holy Roman Emperor Lothair III, sometimes numbered Lothair II and also known as Lothair of Supplinburg (1075 – 4 December 1137), was Holy Roman Emperor from 1133 until his death. He was appointed Duke of Saxony in 1106 and elected King of Germany in 1125 before b ...

. Ida, the mother of Dietrich, was niece of

Saint Bruno of Querfurt Bruno of Querfurt ( 974 – 14 February or 9/14 March 1009), also known as ''Brun'' and ''Boniface'', was a Christian missionary bishop and martyr, who was beheaded near the border of Kievan Rus and Lithuania for trying to spread Christianity. ...

. Dietrich married Mathilde von Walbeck, daughter of

Conrad, Count of Walbeck Conrad (1018–1073), Count of Walbeck and Viscount (Burggraf) of Magdeburg, son of Friedrick, Count of Walbeck, and Thietburga. There is little known about Conrad's reign. The name of the wife is not known. They had only one recorded daughter: ...

. Dietrich and Mathilde had four children: *

Helperich von Plötzkau, Margrave of the Nordmark Helperich (Helferich) (d. 1118), Count of Plötzkau and Walbeck, and Margrave of the Nordmark, son of Dietrich, Count of Plötzkau, and Mathilde von Walbeck, daughter of Conrad, Count of Walbeck, and Adelheid of Bavaria. The count's sister Irmg ...

* Conrad von Plötzkau * Irmgard von Plötzkau, married to

Lothair Udo III, Margrave of the Nordmark Lothair Udo III (1070-1106), Margrave of the Nordmark and Count of Stade (as Lothair Udo IV), son of Lothair Udo II, Margrave of the Nordmark, and Oda of Werl, daughter of Herman III, Count of Werl, and Richenza of Swabia. Brother of his predec ...

* Adelheid von Plötzkau, married Otto I, Burgrraf von Regensburg, son of Heinrich I, Graf von Sinzing. Upon his death, Dietrich was succeed as Count of Plötzkau by his son Helperich.

Sources

Hucke, Richard G., ''Die Grafen von Stade. 900–1144''. Genealogie, politische Stellung, Comitat und Allodialbesitz der sächsischen Udonen. Stade 1956 {{DEFAULTSORT:Dietrich, Count of Plotzkau Counts of Germany