Step 1: Recall regional leaders of 1857:
Each centre of the 1857 revolt had its own leader: Kanpur -- Nana Saheb (with Tantia Tope); Bihar (Arrah/Jagdishpur) -- Babu Kunwar Singh; Faizabad -- Maulvi Ahmad Ullah; Bareilly -- Khan Bahadur Khan.
Step 2: Match Kanpur:
Nana Saheb, the adopted heir of the last Peshwa Baji Rao II, led the uprising at Kanpur and briefly proclaimed himself Peshwa.
Final Answer:
\[ \boxed{\text{Nana Saheb}} \]