His father, Kalbali Khan Khazen al Khalvat, was a minor court official in the reign of Mozaffar ad-Din Shah Qajar.

In March 1926, with the approval of parliament, he dissolved Iran's entire judiciary, initiating a wave of fundamental restructuring and overhauling reforms with the aid of French judicial experts.

Dāvar subsequently attempted to expand the new system into other cities of Iran through a programme involving training of 250 judges.

The bill came under heavy protest from the British and the Russian governments, putting intense pressure on Dāvar's ministry.

Rumors spread that two days earlier Dāvar had been in private severely reprimanded and threatened by Reza Pahlavi.

Some newspapers wrote that he had died of a heart attack, however others suggested that his death had been related to his proposed American bill to Majlis.