On the appearance of Radha in texts, there is a good and long overview in Hardy’s Viraha-bhakti. 

To Andrew’s references, Bhatta Narayana’s Venisamhara can be added, which mentions Radha in one of the nandi verses. He is prior to 800 AD. 

Best wishes 

From: INDOLOGY <indology-bounces@list.indology.info> on behalf of Nagaraj Paturi via INDOLOGY <indology@list.indology.info>
Sent: Thursday, June 17, 2021 10:30:38 AM
To: luther obrock <luther.obrock@gmail.com>
Cc: Indology List <indology@list.indology.info>
Subject: Re: [INDOLOGY] Radha Krishnha
Miller, Barbara Stoler (1975). "Rādhā: Consort of Kṛṣṇa's Vernal Passion"Journal of the American Oriental Society95 (4): 655–671. doi:10.2307/601022ISSN 0003-0279.

gives references from  older texts like Venisamhara, Dhvanyaloka, Lochana etc. 

On Thu, Jun 17, 2021 at 7:05 PM luther obrock via INDOLOGY <indology@list.indology.info> wrote:
Dear Harsha,

If I remember correctly, the first named mention of Rādhā is in Kṣemendra's 11c. Daśāvatāracarita. I'm sure there is a deeper history to that, but I am unaware of anything earlier than that in either the architectural/epigraphical or literary record.


On Thu, Jun 17, 2021 at 8:29 AM Harsha Dehejia via INDOLOGY <indology@list.indology.info> wrote:

Most of the Radha Krishna temples are in the Mathura area and are from the 16/17th century.
Are there any ancient temples of Radha Krishna anywhere else?

Kind regards,

Prof. Harsha V. Dehejia

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Nagaraj Paturi
Hyderabad, Telangana, INDIA.

Director, Indic Academy
BoS, MIT School of Vedic Sciences, Pune, Maharashtra
BoS Kavikulaguru Kalidasa Sanskrit University, Ramtek, Maharashtra
BoS Veda Vijnana Gurukula, Bengaluru.
Member, Advisory Council, Veda Vijnana Shodha Samsthanam, Bengaluru
BoS Rashtram School of Public Leadership
Editor-in-Chief, International Journal of Studies in Public Leadership
Former Senior Professor of Cultural Studies, 
FLAME School of Communication and FLAME School of  Liberal Education, 
Hyderabad, Telangana, INDIA.