Question

when 2nd Buddhist Council held?

Answer 1

Second Buddhist council
The Second Buddhist council took place approximately in 334 BCE, seventy years after the Buddha's parinirvāṇa. The Second Council resulted in the first schism in the Sangha, probably caused by a group of reformists called Sthaviras who split from the conservative majority Mahāsāṃghikas.[1] After unsuccessfully trying to modify the Vinaya, a small group of "elderly members", i.e. sthaviras, broke away from the majority Mahāsāṃghika during the Second Buddhist council, giving rise to the Sthavira sect.[2]
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Answer 2

2nd Buddhist council held in 334 BCE