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Augmented Reality (AR) experiences generally function well indoors, inside buildings, where, typically, lighting conditions are stable, the scale of the environment is small and fixed, and markers can be easily placed. This is not the case for outdoor AR experiences. In this paper, we present practical solutions for an AR application that virtually restores Sheffield's medieval castle to the Castlegate area in Sheffield city centre where it once stood. A simplified 3D model of the area, together with sensor fusion, is used to support a user alignment process and subsequent orientation tracking. Rendering realism is improved by using directional lighting matching that of the sun, a virtual ground plane and depth masking based on the same model used in the alignment stage. The depth masking ensures the castle sits correctly in front of or behind real buildings, as necessary, thus addressing the occlusion problem. The Unity game engine is used for development and the resulting app runs in real-time on recent high-spec Android mobile phones.

An overview of the relationship between archaeology and history is presented as the context in which to situate the argument that a rapprochement between the disciplines can be achieved only if we begin to think of texts and objects as having had efficacy in the past rather than just as evidence about it. Discussions of the meaning of material culture and the power of texts conclude with the suggestion that historical archaeologists need to be more cognizant of the latter. A case-study from the Roman world is used to illustrate the fact that texts can be both instruments of oppression and vehicles for enlightenment and liberation.