Oldest Records of Indo-European Languages

Corrigenda:
1. Linear B, the written form of Mycenaean (which was Ancient Greek to the Ancient Greeks) ought to be included in this video. The oldest records survive on clay tablets that were baked by structure fires c. 1200 BC. Here's a link to an image of a catalogue of vessels from the palace at Pylos: upload.wikimed...
2. At 2:29, I should have said that Hittite was translated around 1915.
3. At 4:50, I misspoke about Sanskrit grammarians: Certainly c. 500 BC, grammarians were commenting on texts that were ancient to them. In my view, a "text" may be written or oral.
Thanks to the viewers who pointed out these errors--you can see their comments below.