Gertrude married King of The Germans Rudolf King of The Germans, I in Jan 1245. Rudolf (son of Count of Habsburg Albrecht, IV and Countess of Kyburg Hedwige) was born on 1 May 1218 in Schloss Limburg, A.d. Rh., Freiburg, Baden, Germany; died on 15 Jul 1291 in Germersheim, Oberpfalz, Bavaria; was buried in Dom Speyer, Oberpfalz, Bavaria. [Group Sheet] [Family Chart]

1. King of The Germans Albrecht, I was born in Jul 1248 in Habsburg, Aargau, Switzerland; died on 1 May 1308 in Bei, Brugg, Aargau, Switzerland; was buried in Speyer, Pfalz, Bavaria.
2. Princess of Austria Mathilde was born about 1251 in Habsburg, Argau, Switzerland; died on 23 Dec 1304.
3. Prince of Austria Friedrich was born about 1254 in Habsburg, Argau, Switzerland.
4. Prince of Austria Rudolf was born about 1255 in Habsburg, Argau, Switzerland.
5. Princess of Austria Katharine was born about 1256 in Habsburg, Argau, Switzerland; died on 4 Apr 1282.
6. Princess of Austria Hedwig was born about 1258 in Habsburg, Argau, Switzerland; died in 1303.
7. Princess of Austria Agnes Gertrude was born about 1260 in Habsburg, Argau, Switzerland; died on 11 Oct 1322.
8. Prince of Austria Hartmann was born in 1263 in Habsburg, Argau, Switzerland; died on 21 Dec 1281.
9. Archduke of Austria Rudolf, II was born about 1271 in Habsburg, Aargau, Switzerland; died on 10 May 1290.
10. Princess of Austria Jutte was born on 13 Mar 1271 in Habsburg, Aargau, Switzerland; died on 18 Jun 1297.
11. Archduchess of Austria Klementie was born about 1272 in Habsburg, Aargau, Switzerland; died after 07 Feb 1293.
12. Princess of Austria Eufemie was born about 1274 in Habsburg, Arau, Switzerland; died in 1282.
13. Prince of Austria Karl was born on 14 Feb 1276 in Habsburg, Argau, Szwitzerland; died on 16 Aug 1276.

Burkhard married Countess of Tubingen Mathilde in 1224. Mathilde was born about 1205 in Tubingen, Schwarzwaldkreis, Wurttemberg. [Group Sheet] [Family Chart]