Who is known as 'Trimurthy of Carnatic Music'?

Three great saint composers - Thyagaraja, Muthuswami Dikshitar and Shyama Sastri are known as the 'Trimurti' of Carnatic music. They were not only contemporaries during the later half of the 18^th century and the beginning of the 19^th century, but were also, incredibly, born in the same town of Thiruvarur in the Thanjavur district of Tamil Nadu.