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"Sancha of Castile, Queen of Navarre" at [1], begins with a cautionary note, "Not to be confused with Sancha of Castile, Queen of Aragon, who was also daughter of Alfonso VII of León and Castile but by his second marriage to Richeza of Poland." This Sancha of Castile (Queen of Navarre) married Sancho VI of Navarre.
"Sancha of Castile, Queen of Aragon" at [2], begins with a similar cautionary note, "Not to be confused with Sancha of Castile, Queen of Navarre." This Sancho of Castile (Queen of Aragon) married Alfonso II of Aragon, and one of their children was Peter II of Aragon.
Sure enough, "Peter II of Aragon" at [3], states that Peter II was a son of Alfonso II of Aragon and Sancha of Castile, but the hyperlink text "Sancho of Castile" actually links to "Sancha of Castile, Queen of Navarre," the wrong Sancha of Castile.
I have not checked other articles with links to these two "Sancha of Castile" articles for accuracy.