The Afghan government's announcement last summer that Mullah Omar, the reclusive one-eyed founder of the group, had died two years earlier in Pakistan aggravated longtime rifts within the movement.
Many senior figures said his deputy-turned-successor, Mullah Akhtar Mansoor, had deliberately misled them.
The upheaval led to the collapse of Pakistan-brokered face-to-face talks between Kabul and the Taliban after just one round, and clashes flared between Mansoor loyalists and a splinter group led by Mullah Mohammad Rasool, which declared him the leader of the Taliban in November.
Relatives of Mullah Omar, notably his brother Manan and son Yaqub, had objected to the selection of Mansoor, which was done by a small inner circle of senior Taliban leaders. But they were persuaded last year to drop their objections and publicly declared their loyalty to Mansoor.
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The Taliban's former foreign minister, Mohammad Ghaws, said he hoped the united front would help future peace talks succeed. "I am not in favour of or against any faction," he said, but if Rasool had continued to oppose Mansoor and the majority allied with him it would have brought "no good to the Taliban or to Islam."
The Taliban's growing unity - brokered by religious scholars within the movement - has raised hopes that the group can be brought back into peace talks to end 15 years of war.
Afghanistan, Pakistan, the US and China plan to hold a third round of talks tomorrow to lay the groundwork for the renewal of direct talks between Kabul and the Taliban.