• Invasion of the Celts into Ireland.
• Kingdom of Macedon conquers Persian empire
• Romans build first aqueduct
• Chinese use bellows

Significant persons:

• Plato, philosopher
• Aristotle, philosopher and scientist
• Philip II of Macedon
• Alexander the Great, King of Macedon, invades Asia Minor, Persia and reaches India

Inventions, Discoveries, Introductions

• Oldest Brahmi[?] script dates from this period. Brahmi is the ancestor of Indic scripts.

Decades and Years

400s BC	409 BC	408 BC	407 BC	406 BC	405 BC	404 BC	403 BC	402 BC	401 BC	400 BC
390s BC	399 BC	398 BC	397 BC	396 BC	395 BC	394 BC	393 BC	392 BC	391 BC	390 BC
380s BC	389 BC	388 BC	387 BC	386 BC	385 BC	384 BC	383 BC	382 BC	381 BC	380 BC
370s BC	379 BC	378 BC	377 BC	376 BC	375 BC	374 BC	373 BC	372 BC	371 BC	370 BC
360s BC	369 BC	368 BC	367 BC	366 BC	365 BC	364 BC	363 BC	362 BC	361 BC	360 BC
350s BC	359 BC	358 BC	357 BC	356 BC	355 BC	354 BC	353 BC	352 BC	351 BC	350 BC
340s BC	349 BC	348 BC	347 BC	346 BC	345 BC	344 BC	343 BC	342 BC	341 BC	340 BC
330s BC	339 BC	338 BC	337 BC	336 BC	335 BC	334 BC	333 BC	332 BC	331 BC	330 BC
320s BC	329 BC	328 BC	327 BC	326 BC	325 BC	324 BC	323 BC	322 BC	321 BC	320 BC
310s BC	319 BC	318 BC	317 BC	316 BC	315 BC	314 BC	313 BC	312 BC	311 BC	310 BC
300s BC	309 BC	308 BC	307 BC	306 BC	305 BC	304 BC	303 BC	302 BC	301 BC	300 BC
290s BC	299 BC	298 BC	297 BC	296 BC	295 BC	294 BC	293 BC	292 BC	291 BC	290 BC