flagitate
To importune; to demand fiercely or with passion.
archaic
Holy Virgin stood in the main Convent of Glatz, in rather a threadbare condition, when the Prussians first approached; the Jesuits, and ardently Orthodox of both sexes, flagitating Heaven and her with their prayers, that she would vouchsafe to keep the Prussians out.
Where it comes from
First attested in 1623; borrowed from Latin flāgitātus, perfect passive participle of flāgitō (“to demand, ask urgingly”), see -ate (verb-forming suffix).
Adapted from the Wiktionary entry flagitate (CC BY-SA 4.0).