D. Domingo Fariña fue secretario del S. O., t.p.h.a. (tuvo por hijos):
4. Da Dominga Fariña que se caso D. Antonio Ruoibal.
From that I went to the section in Volume IV called Ruibal. It states there that the family is from Tuy, and they derive from the family of Don Pedro Regalado de Silva Ruibal (o Ruybal). This appears to be a later family than Pedro Roybal Torrado, and they use the Silva Ruibal quite often. All this information needs to be studied further in order to tie them to Pedro Roybal Torrado and Elena de la Cruz.