ematic ian ▁and ▁expl orer ▁who ▁mapped ▁the ▁upper ▁Mississippi ▁River ; ▁names ake ▁of ▁City ▁of ▁Nicol let , ▁County ▁of ▁Nicol let ▁and ▁Nicol let ▁Island ▁in ▁Minnesota . ▁Daniel ▁P atter son , ▁( 1 7 8 6 – 1 8 3 1 ) ▁U . S . ▁Navy ▁comm odore ▁Thomas ▁H . ▁P atter son , ▁( 1 8 2 0 – 1 8 8 9 ), ▁U . S . ▁Navy ▁rear ▁adm iral ▁William ▁P ink ney , ▁( 1 7 6 4 – 1 8 2 2 ), ▁U . S . ▁and ▁Maryland ▁Att orney ▁General , ▁Mayor ▁of ▁Ann apolis , ▁states man ▁and ▁diplom at ▁Alfred ▁Ple as ont on , ▁( 1 8 2 4 – 1 8 9 7 ), ▁Union ▁Army ▁general ▁Stephen ▁Ple as ont on , ▁( 1 7 7 6 – 1 8 5 5 ), ▁saving ▁pr ic eless ▁early ▁government ▁documents ▁during ▁the ▁burning ▁of ▁Washington ▁in ▁ 1 8 1 4 ▁James ▁W . ▁P umph rey , ▁( 1 8 3 2 – 1 9 0 6 ), ▁li very ▁stable ▁owner ▁who ▁r ented ▁a ▁horse ▁to ▁John ▁Wil kes ▁Bo oth , ▁used ▁to ▁escape ▁Ford ' s ▁Theatre . ▁P ush - Ma - T a - Ha , ▁( c . ▁ 1 7 6 0 ▁– ▁ 1 8 2 4 ), ▁Native ▁American ▁( Cho ct aw ) ▁chief ▁ ▁C ok ie ▁Roberts , ▁(