[Still conciliatory], the Senate approved.

Octavian would eventually ally himself with Caesar's old companion, Mark Antony, who was pursuing an accord with the Senate. But that accord would soon end. As consul, Antony canceled the Senate's appointment of one of Caesar's assassins, Decimus Brutus (no relation to Marcus Brutus), to the governorship of Cisalpine Gaul. With Antony's position as consul soon to expire, he appointed himself to that governorship. Still conciliatory, the Senate approved.
[Source: The Assassination Fails Politically http://www.fsmitha.com/h1/rome15.htm]
I'd like to know if "still conciliatory" is an adverbial phrase.
Thank you in advance for your help.