Greetings Indologists,

I am looking for some help from the list's esteemed cadre of experts on Tamil Nadu. Direct answers or references to secondary sources are both welcome. 

If I am reading Gopalan's preface to Raghavan's edition of the Cola Campu correctly, the Brhadisvara Mahatmya attributes the establishment of Tanjore's Konkanesvara Temple to the siddha Konganar. Is this correct (narratively speaking, not historically)? If so, do we have any reliable dates for the Brhadisvara Mahatmya? 

At Konkanesvara, there are several images (paintings and statues) of an ascetic riding upon a tiger. Local informants explained that this image represents Konganar Cittar himself, and relates to a local legend in which Śiva came to reside in Konganar's jatamukuta and Indra transformed into his tiger mount. Can anyone corroborate these details? If so, is this legend, particularly the tiger-riding element, attested in any written sources (of course, not to imply that a narrative must to be written to be important)?

Many thanks.

PS. I'm writing from my phone so I apologize for the lack of diacritics.