The "XV" in Pierre's name indicates that he was the fifteenth child born to these parents. This is done to distinguish him from three other brothers also named Pierre (VI)(IX)(XI).
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Pierre is
15 degrees from Daniel Burnham, 22 degrees from David Childs, 29 degrees from Frank Gehry, 16 degrees from Cass Gilbert, 17 degrees from Henry Hardenbergh, 32 degrees from Maya Ying Lin, 14 degrees from Frederick Olmsted, 28 degrees from I. M. Pei, 17 degrees from John Roebling, 18 degrees from Stanford White, 18 degrees from Frank Wright and 22 degrees from Minoru Yamasaki
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