They were used to agree upon the raising of taxes which, in the 13th century, were single, one-off levies, typically on movable property, intended to support the King's normal revenues for particular projects.
Estas reunións utilizáronse para acordar os aumentos dos impostos que, durante o século XIII, eran simples, únicos, tipicamente bens mobles, pensados para apoiar os ingresos do rei para proxectos particulares.