Nice try. The first crossword puzzle was actually written by Gronk the Feckless about 200,000 years ago. The full puzzle has been faithfully transcribed by yours truly and is as follows¹:
S
T
R O C K
N
E
S T I C K
A
V
F I R E
¹ NOTE: There were no clues. The biggest challenge facing neanderthals at the time was just getting the words to cross.