Major Dixon Denham, Captain
Hugh Clapperton and Doctor Walter Oudney in 1822, 1823 and 1824,
following up on the travels of Ritchie & Lyon to Murzuk
in 1818. They travelled from Tripoli to Murzuk, to Lake Chad,
to Kano and Sokoto.
The following reproduction shows
the reception of the Mission by the Sultan of Bornou (done from
a sketch of Major Denham's).