Milligan, Matthew David. ‘A Study of Inscribed Reliefs within the Context of Donative Inscriptions at Sanchi’. M. A. thesis, University of Texas at Austin, 2010. [official site URI / PDF]
From the abstract
Inscribed relief art at the early Buddhist archaeological site of Sanchi in India exhibits at least one interesting quality not found elsewhere at the site. […] Two inscribed images of stūpas found on the southern gateway record the gifts of two prominent individuals. The first is a junior monk whose teacher holds a high position in the local order. The second is the son of the foreman of the artisans of a king. Both inscribed stūpa images represent a departure from a previous donative epigraphical habit. Instead of inscribing their names on image-less architectural pieces, these two particular individuals inscribed their names on representations of stūpas, a symbol with a multiplicity of meanings. […] I suggest that these donations were recorded as part of the visual field intentionally, showing the importance of not only inscribing a name on an auspicious symbol but also the importance of inscribing a name for the purpose of being seen.