▁seems ▁probable ▁that ▁he ▁studied ▁with ▁Lan fran co ▁between ▁ 1 6 4 4 ▁and ▁ 1 6 4 6 . ▁During ▁those ▁same ▁years ▁he ▁came ▁into ▁contact ▁with ▁artists ▁such ▁as ▁R iber a , ▁Francesco ▁V ac car o , ▁Mass imo ▁St anz ione , ▁and ▁Charles ▁M ell in . ▁ ▁Here , ▁he ▁was ▁married ▁for ▁a ▁second ▁time , ▁to ▁the ▁wid ow ▁Ma ff ei , ▁Por zia ▁Camp agna ▁( or ▁Comp agna ). ▁ ▁Rome ▁In ▁ 1 6 4 7 , ▁Pietro ▁and ▁his ▁family ▁moved ▁to ▁Rome ▁in ▁order ▁to ▁be ▁near ▁Lan fran co , ▁who ▁had ▁just ▁returned ▁to ▁the ▁capital ▁and ▁for ▁whom ▁Del ▁P ò ▁had ▁become ▁“ his ▁most ▁useful ▁assistant ”. ▁In ▁ 1 6 4 9 ▁his ▁daughter ▁Ter esa , ▁who ▁later ▁also ▁became ▁an ▁eng ra ver ▁and ▁painter . ▁▁ ▁Between ▁ 1 6 5 1 ▁and ▁ 1 6 5 2 ▁Del ▁P ò ▁lived ▁on ▁Via ▁Marg ut ta , ▁the ▁artists ' ▁quarter , ▁where ▁he ▁met ▁Jean ▁D ugh et , ▁for ▁whom ▁he ▁produced ▁several ▁et ch ings ▁after ▁subjects ▁by ▁Nicholas ▁P ous sin . ▁In ▁fact , ▁it ▁seems ▁that ▁P ous sin ▁assigned ▁to ▁D ugh et ▁the ▁task ▁of ▁reprodu cing ▁his ▁paint ings ▁in ▁et ch ings , ▁and ▁later ▁dedicated ▁them ▁to ▁his ▁most ▁important ▁pat rons . ▁De ▁D omen ici ▁believed ▁that ▁Pietro ▁del ▁P ò ▁knew