Though peerage articles, including CP [Complete Peerage] V 472, have long identified Ida No. 27 [ie. this Ida] as a daughter of Gen. 26 [William Longspee & Ela FitzPatrick], it is clear that their daughter Ida actually married (1) Ralph de Somery (dsp) and (2) bef. 1220 William Beauchamp, of Bedford (see 122A-29 (CP XII (1) note g, which says this Ida living 10 Apr 1262). Moriarty (ms. at NEHGS) suggested William Longespee had two daughters Ida, or Idoine, which may be correct. But there appears almost a generation difference between the two Ida's, so the chronicler may have missed a generation and Ida No 27 may be the daughter of William's son William II (122-29). [Ancestral Roots]
Note: based on the above, I am making Ida, a daughter of William II Longespee.