Константин IV
Pope Agatho died on 10 January 681, and although Leo was elected within days, he was not consecrated until 17 August 682. The reason may have been due to Agatho's negotiations with Emperor Constantine IV regarding imperial control of papal elections. Constantine IV had already promised Agatho to abolish or reduce the tax that the popes had been paying to the imperial treasury at the time of their consecration, an imperial policy that had been in force for about a century.