From my [understanding](http://en.wikipedia.org/wiki/Bhakti_movement) the Bhakti movement did not start until around 700 - 1000 CE in Tamil Nadu.

My understanding of Bhakti is that it is a pure, selfless love towards a deity. A path which can ultimately lead to self realisation, as described in the Bhagavad Gita.

There have obviously been great proponents of bhakti yoga since this period. 
E.g. Vallabha Acharya, Chaitanya Mahaprabhu etc.

So to me,it's clear this was a post vedic movement. But as a concept is there any origin in the Vedic age?

The vedas mentions worship of primal gods such as Agni, Vayu, Indra etc. But was this really the same bhakti as described in the Gita? To me, worship in the vedic age was to appease gods, so as to receive their benefaction.

Is there any reference to bhakti as a concept in the vedic age, with the same meaning as described in the Gita? I.e. as a path that can lead to knowledge of the Self, and not merely for appeasement?