(2) O. Martins' _Sons of Don John I._

XI. For Chapter XI. (Henry's Political Life, 1433-41): (1) Pina's
_Chronicle of King Edward_; (2) O. Martins' _Sons of Don John I._; (3)
Azurara's _Chronicle of John I._; (4) Pina's _Chronicle of Affonso V._

XII. For Chapter XII. (From Boyador to Cape Verde).--(1) Azurara's
_Guinea_; (2) De Barros; (3) Pina's _Chronicle of Affonso V._; (4) O.
Martins' _Sons of Don John I._

For Chapters XIII. to the end.--(1) Azurara's _Discovery and Conquest of
Guinea_; (2) Narratives of Cadamosto and Diego Gomez; (3) Pina's
_Chronicle of Affonso V._; (4) Prince Henry's Charters.

The three modern lives of Prince Henry which I have chiefly consulted
are:

R.H. Major's _Henry the Navigator_, Wappäus' _Heinrich der Seeffahrer_,
and De Weer's _Prinz Heinrich_, with O. Martins' _Lives of the Infants
of the House of Aviz_ in his _Sons of Don John I._

The maps and illustrations have been planned in a regular series.

I. As to the former, they are meant to show in an historical succession
the course of geographical advance in Christendom down to the death of
Prince Henry (1460). Setting aside the Ptolemy, which represents the
knowledge of the world at its height in the pre-Christian civilisation,
and the Edrisi which represents the Arabic followers of Ptolemy, whose
influence upon early Christian geography was very marked, all the maps
reproduced belong to the science of the Christian ages and countries.