question: What is the place of birth of Gerard I, Count Of Guelders's wife?
context: Title: Gerard I, Count of Guelders
  Passage: Gerard I of Guelders (c. 1060 – 8 March 1129) was Count of Guelders (Gelre in Dutch). He was the son of Theodoric of Wassenberg. He may have been married to Clementia of Aquitaine, although that proposed marriage seems to be based on a falsified document. It is also possible that he married an unnamed daughter of William I, Count of Burgundy. Gerard had three children:
  Title: Clementia of Aquitaine
  Passage: Clémence d'Aquitaine (1060 – 4 January 1142) was a daughter of Pierre-Guillaume VII, duke of Aquitaine, and his wife Ermesinde. She married firstly around 1075 to Conrad I of Luxembourg ( 1040 † 1086), count of Luxembourg, and had: Widowed, she remarried to Gerard I († 1129), count of Wassenberg and of Guelders. This count married twice and had two children, neither of whose mothers has been identified. These two children, perhaps born to Clémence, were :
answer: Luxembourg
citations: Gerard I, Count of Guelders Clementia of Aquitaine