The cave is blocked by rocks at 831 AD. There are two steps to getting the vase:
1) Go to the Great Wall of China (1593 AD, 6 o'clock on the time device). Go right and follow the path of black dirt. There is a barrel of gunpowder. (While you are here, climb up the wall to the upper right to win the Thor Amulet in a memory game.
2) Go to the Viking Age (831 AD, 2 o'clock on your time device. There will be a Viking who is upset. Give him the amulet. Go up the rocks until you come to a pile of rocks - click on the wall and the gunpowder will blast it open. You have to go through the dark cave with just your torch, before it goes out. Run down, up, up ,up, across, down, and left, jumping the three puddles at the end. Once you have the vase, you can leave with the time device.
*Once you get the Glider Wings from Leonardo da vinci (1516 AD), you can return to this island and recover the Viking armor that is atop the tall rock on the far right. It has no role in the game, however.
(see related question)
It should be in the cave when you get in there.
When you have recovered the golden vase from the cave at 831 AD, you return it to the guards at the first building, the Treasury.
get the gold vase
On time tangled island.
in a cave where the vikings are
The cave is located in 0831 AD.
no there is no map for the cave I think
It is at the bottom left corner of the viking's cave
At the bottom is the Golden Vase For the knights at the first place.
The golden vase is in the rocked-up cave at the Vikings island (831 AD). It should be returned to the guards at the Treasury in Ancient Greece (328 BC, which is 1 o'clock on the time device).
There is a Golden Vase on Time Tangled island, which is hidden in a cave at 831 AD and needs to be returned to 328 BC. There is the "fingo", an urn-shaped artifact, on Nabooti Island.
The Golden Vase is in the cave at 831 AD. It should be returned to the Greek Treasury at 328 BC (1 o'clock on the time device). Give it to the guards there.