SIEGFRIED [II] von Stade, son of HEINRICH "der Kahle" Graf im Heiangau & his first wife Judith von der Wetterau [Konradiner] ([965]-6 Jan or 1 May 1037). "Heinricum, Udonem et Sigefridum" are named as the three sons of Judith in the Annalista Saxo, Siegfried being named "filio Heinrici comitis de Stathen" in a later passage[1848]. Thietmar also names his three maternal uncles "Heinrich, Udo and Siegfried", specifying that Heinrich and Siegfried were captured by the pirates together with Count Adalgar when their brother Udo was killed [23 Jun 994][1849]. Adam of Bremen names "marchio Sigafridus, comes Thiadricus" among the Saxons captured by Danes at "apud Stadium", specifying that "marchio Sigafridus" was the only one able to escape to seek help, returning with "dux Benno" with whom he was victorious[1850]. The passage is undated but adjacent paragraphs suggest that it relates to an incident in the late 980s/early 990s. The Annales Corbeienses record that "duo fratres…Heinricus et Sigifrdus" were captured in 994 and "tertius Udo" killed[1851]. Thietmar also records that Siegfried eventually escaped from captivity to seek help for the remaining captives[1852]. Graf von Stade. The necrology of Lüneburg records the death "1 May" of "Sifridus com"[1853].

m (before 23 Jun 994) ADELA von Alsleben, daughter of GERO Graf von Alsleben & his wife Adela --- (-1 May --). The wife of "Sigefrido filio Heinrici comitis de Stathen" is named "Athela" in the Annalista Saxo, which also names their son and two daughters. She is named "Adhelam filiam Geronis comitis de Alesleve" in a later passage[1854]. Thietmar records that Siegfried was welcomed back by "his wife Adela" after his escape from captivity[1855]. The Chronicon Monasterii Rosenfeld seu Hassefeld records the death “VIII Id Jan” of “Sifridus comes, filius Henrici boni” [which contradicts the sources quoted above] and in the next line “Kal Mai” of “Adela cometissa uxor”[1856].

Graf Siegfried [II] & his wife had three children:

1. LOTHAR-UDO [II] von Stade (after 23 Jun 994-7 Nov 1057). He is named "Liutgerum comitem", and his parentage specified, in the Annalista Saxo[1857]. His birth date is estimated from Thietmar recording that his father Siegfried had no sons for use as hostages at the time of his capture by pirates in Jun 994[1858]. He succeeded his father in 1037 as Graf von Stade. He succeeded in 1056 as LOTHAR-UDO I Markgraf der Nordmark. The necrology of Lüneburg records the death "6 Nov" of "Udo com"[1859]. m ([1025]%29 ADELHEID [von Rheinfelden], daughter of --- (-7 Dec after 1057, bur Alsleben). The Annales Stadenses name "Adelheithim amitam Rodolfi [von Rheinfelden]" as wife of "comitem Luderum"[1860]. Other parts of these Annales appear unreliable and this statement should be treated with caution until corroborated by another source. The word “amita”, if used in its strict sense, would indicate paternal aunt, but it has been observed that the terms patruus/avunculus/amita/matertera are sometimes used indiscriminately in medieval sources to indicate relationships on either the paternal or maternal side of a family. The Chronicon Monasterii Rosenfeld seu Hassefeld records the death “VII Id Nov” of “Luderus comes, qui capellam sancti Nicolai construxit” and in the next line “VII Id Dec” of “Adelheit cometissa uxor Luderi comitis”[1861]. Graf Lothar-Udo [II] & his wife had one child:

a) LOTHAR-UDO [III] von Stade ([1020/30]-4 May 1082). The Annales Stadenses name "Udonem primum" as son of "comitem Luderum" & his wife Adelheid[1862]. Graf von Stade. He succeeded his father in 1057 as LOTHAR-UDO II Markgraf der Nordmark.

2. IRMGARD von Stade . "Irmingardem et Bertam abbatissas de Alesleve" are named, and their parentage specified, in the Annalista Saxo[1863]. Abbess of Alsleben.
3. BERTHA von Stade . "Irmingardem et Bertam abbatissas de Alesleve" are named, and their parentage specified, in the Annalista Saxo[1864]. Abbess of Alsleben.

https://fmg.ac/Projects/MedLands/SAXON%20NOBILITY.htm#SiegfriedIISt...

• Source: NKG VIII-23, Alvericus page14
• Finnholbeck: Person ID I27277 Graf Siegfried II. von Stade
• Wikipedia