His sketches are usually not dated. The crossbow must have been done in Milan, about 1490.
About 1485.
when he was alive
Because he wanted to, do you have a problem with that?
yes
Leonardo Da Vinci
No, it seems to have remained a sketch.
No, it was just a sketch.
They are at Windsor Castle in England.
He made a rough sketch 1500, in Venice.
about 17 years old he told his dad i want to save my art works so his dad bought him a sketch book
Yes, Leonardo da Vinci did.
He made a rough sketch in 1499 in Venice.