Union of Arms

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The Union of Arms (in Spanish Unión de Armas) was a political proposal, put forward by Gaspar de Guzmán, Count-Duke of Olivares, for greater military co-operation between the constituent parts of the composite monarchy ruled by Philip IV of Spain.[1]

The plan was for each of the kingdoms ruled by Philip to contribute equitably to a fund from which 140,000 troops would be maintained for the defense of the monarchy.[2] The division of contributions envisaged was:[3]

Although the proposal ultimately failed, it was an important factor in the growing mistrust of Castilian hegemony that led to the Catalan Revolt and the Portuguese Restoration War.


  1. I. A. A. Thompson, "Castile, Spain and the Monarchy", in Spain, Europe and the Atlantic (Festschrift for J. H. Elliott), edited by Richard L. Kagan and Geoffrey Parker (Cambridge University Press, 1995), pp. 147-148.
  2. Colin Pendrill, Spain, 1474–1700 (Oxford, 2002), p. 137.
  3. Propositie gedaen aen de Staten van Braband door Don Diego van Mexia (n.p.d.). Available on Google Books.