A Quadruple Alliance is formed of Britain, France, Spain and
Portugal, who ally in support of liberal constitutions in the
Iberian Peninsula. In Portugal, Dom Miguel, uncle to the rightful
Queen Maria II, is attempting to cling on to power.
Citation:
Editors. "Britain, France, Spain and Portugal ally in support of liberal constitutions".
The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17999, accessed 22 May 2013.]