You can take every path you like from the drawn paths, but you cannot repeat letters in the same word (person's name).
There are at least 23 historical figures on the board.
Here is also a text version of the grid:
F---E---U---E---N---R---T
|\ /|\ /|\ /|\ /|\ /|\ /|
| R-+-C-+-D-+-A-+-E-+-I |
|/|\|/|\|/|\|/|\|/|\|/|\|
O-+-C-+-I-+-C-+-N-+-T-+-I
|\|/|\|/|\|/|\|/|\|/|\|/|
| H-+-E-+-M-+-E-+-F-+-A |
|/|\|/|\|/|\|/|\|/|\|/|\|
E-+-L-+-A-+-K-+-N-+-R-+-C
|\|/|\|/|\|/|\|/|\|/|\|/|
| G-+-N-+-D-+-S-+-A-+-P |
|/|\|/|\|/|\|/|\|/|\|/|\|
L-+-S-+-T-+-H-+-O-+-B-+-O
|\|/|\|/|\|/|\|/|\|/|\|/|
| O-+-E-+-A-+-G-+-G-+-L |
|/|\|/|\|/|\|/|\|/|\|/|\|
C-+-N-+-S-+-L-+-S-+-A-+-O
|\|/|\|/|\|/|\|/|\|/|\|/|
| R-+-T-+-I-+-E-+-D-+-A |
|/ \|/ \|/ \|/ \|/ \|/ \|
F---A---N---L---I---M---S
PS. There are no unused letters on the board.
Hint:
5 people are still missing from all the answers. 4 are writers and 1 is a navigator. The 5 words are respectively of lengths: 5, 6, 7, 7, 8.
Dickens
can be the 7 letter writer at (6,2). $\endgroup$ – Takeshi Sep 2 '16 at 6:53