Hypothesis Historia Periodical is a double-blind peer-review international journal in the field of Alternative and Alternate History (AH), cross-referencing the theme with all areas of knowledge and expertise, from Fine Arts to Natural Sciences, from Literature to Economy. It is published in English as part of the Casa Comum of the Rectorate of the University of Porto, Portugal, and has an ISSN number.

Founded by the members of Invicta Imaginaria, the informal creative collective for the Winepunk Universe and CETAPS – Centre for English, translation and Anglo-Portuguese Studies, in a partnership among Casa Comum, Invicta Imaginaria and several research centers, the journal aims at providing a space for the publication of original, significant and innovative studies in Alternate and Alternative History, with special focus on those intersecting other fields, such as Experimental Sciences, Fine Arts, or Economy.

Hypothesis Historia Periodical is a pluralist publication with no ideological affiliation and open to proposals and perspectives from all research methodologies.