Who is the author of 'प्रेमसागर'?

'प्रेमसागर' (Prem Sagar) is a landmark work of modern Hindi prose, composed in Khari Boli. It was written by Lallu Lal (लल्लू लाल) in the early 19th century ($1803\text{–}1810$) during his time at Fort William College, Kolkata.