From typicallyspanish.com

History
Spain On This Day - May 17
By m.p.
May 17, 2008 - 9:31 AM

822: After the death of Al Hakam I, the reign of Abderraman II started in Córdoba. He adopted style from Baghdad and the Iraqi music Ziryab.

1520: Carlos I of Spain signed the document which gave Diego Colón the titles of Admiral and Viceroy of The Indias.

1834: Carlos María Isidro de Borbón, returned from exile.

1856: Queen Isabel II created the Beneficial Order, a form of civil decoration to award those affected by the Asian Cholera.

1902: Alfonso XIII of Spain became an adult, swore to the Constitution and started his reign.

1925: A state of War was declared in Spain.

1928: The telephone service between Spain and Portugal started.

1933: The law for confessions and religious congregations was passed.

1992: Several ETA activists who had fled from Spain were arrested in a restaurant in Montevideo.

1993: The Camino de Santiago was declared a European Heritage site.

2005: The Spanish parliament voted to allow the Zapatero government to start talks with ETA. Only the PP voted against.