Philip V, like Otto, may have reigned, even if for only a few months, in Landau, together with his brother John I. Also, at the time of the division, Philip was not exercising any clerical position (was canon at Mainz in 1530, and then reappears as canon in Cologne in 1544), which would possibly extend a co-rulership that ended with Philip resuming his religious life at Cologne. See Haarmann (2014), p. 21; and Blankertz, Wilhelm, Schloß Hückeswagen Sonderdruck einer Artikelserie des „Bergischer Volksbote" (Burscheider Zeitung) July 1940, PDF, retrieved 14 December 2014.
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Stenographische Berichte über die Verhandlungen des Preußischen Hauses der Abgeordneten: 1877/78, Vol. 2, Part 123, p. 1025
