The articles in this Forum are revised versions of papers presented in a roundtable session of the XXII International Congress of Historical Sciences, which was held in Jinan, China, during August 2015. In line with the roundtable format deployed by the congress, a broad proposition was introduced in the opening paper, followed by four responses delivered by experts in the field and a plenary discussion of the issues raised by the speakers. In this session, the proponent, Ingo Heidbrink, discussed the development of maritime history as a historical sub-discipline in relation to the emergence of world (and global) history. Particular attention was afforded to the comparative growth rates of these cognate sub-disciplines, and to the reasons why maritime history has expanded relatively slowly, leading to the emergence of a ‘blue hole’ in our knowledge and understanding of the past. The four respondents then addressed the issues raised by Heidbrink from their own disciplinary and regional perspectives. As Heidbrink’s ‘Concluding Remarks’ indicate, all participants agreed that, in itself, the allocation of a session to this subject on the core programme of the congress was a significant recognition that maritime history is a historical sub-discipline that is of relevance to the wider global community of historians, and not just those who are interested in the interaction of humans and the oceans.
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