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 18th century and the beginning of the 19th century, but were also, incredibly, born in the same town of Thiruvarur in the Thanjavur district of Tamil Nadu.