Title: A brief relation of the just and undeniable title of Alphonso the Sixth, King of Portugal, now reigning, 1661. Warranted by the fundamental laws of that nation.
Author: Whitfeld, Raphe.
Publication info: Printed at London, ;, and re-printed at Edinburgh, : [s.n.], 1661.
subjects: [Alfonso -- VI, -- King of Castile and Leon, 1030-1109] [Portugal -- Kings and rulers -- Succession -- Early works to 1800] [Portugal -- History -- Alfonso VI, 1656-1683 -- Early works to 1800]