What is associated with: around 1268 roger bacon observed that these new optical devices could be used to improve eyesight?

What is associated with: around 1240 this mongols grandson batu founded the golden horde? What is associated with: around 1250 bc with moses dead the israelites led by this man conquered the land of canaan? What is associated with: around 1250 this countrys king alfonso iii reclaimed the algarve from the moors after 500 year… What is associated with: around 1260 this country acquired greenland iceland under haakon iv haakon iiis illegitimate s… What is associated with: around 1271 the city of herat afghanistan was visited by this famous venetian? Based on the clue 'around 132 ad chinese scientist chang heng invente...', what is the answer? What is associated with: around 1325 bc this boy king was buried in a gold mask inside 4 coffins one of which was made… What is associated with: around 1332 bc this pre teen became king of egypt his reign was kinda meh but the stuff he lef…