Liberalism and radicalism in Spain

This article gives an overview of liberalism and radicalism in Spain. It is limited to liberal and radical parties with substantial support, mainly proved by having been represented in parliament. The sign ⇒ denotes another party in that scheme. For inclusion in this scheme it is not necessary that parties label themselves as a liberal or radical party.
Background.
In the nineteenth century, liberalism was a major political force in Spain, but as in many other continental European countries care must be taken over the use of labels as this term was used with different meanings (this is discussed in the article on Radicalism (historical).
As in much of Europe, the nineteenth-century history of Spain would largely revolve around the conflicts "between" the three major liberal currents - radicalism; progressive classical liberalism, or conservative classical liberalism. While all three rejected the Catholic, traditionalist, and absolutist Old Regime, each had a different perspective on the urgency and degree to which state and society needed reforming to modernize the values and institutions.
Liberal thinkers.
In the Contributions to liberal theory the following Spanish thinkers are included: