Who were Tapussa and Bhallika?

The first disciples of Buddha after becoming enlightened were two merchants named Tapussa and Bhallika. After becoming enlightened, he sought to find his former teachers Arada and Udaka to teach them, but they had died. He then looked for Kaundinya and other companions. Gautama Buddha now preached his first sermon which deals with the Four Noble Truths and the Noble Eightfold Path, the core pillars of Buddhist teaching regarding the intrinsic suffering of existence and how to deal with it. This was called Dhammacakkappavattana Sutta.