Hindutva crazies on dating of the rig veda
In 1583, an English Jesuit travelling to India noted the similarities between Greek, Latin and sanskrit.Two years later, in 1585, an Italian merchant by the name Filippo Sassetti noted the similarities between the words for numbers in and Italian.(Note: It is known that the term "Aryanism" was thought of to represent a race and was used to commit great atrocities. During this period, the out of India theory lost traction due to the lack of linguistic evidence to suggest that sanskrit was the mother of all Indo-European languages. One theory gained pace over the others - the Aryan Invasion Theory.The early proponents of this theory suggested that movements/invasions of Indo-Iranians, directed several excavations in the valley and upon studying the artefacts unearthed, discovered that the Indus Valley civilisation began to decline in 1900 BCE and was completely abandoned by 1300-1200 BCE.
They used grammar, semantics, vocabulary, sound structures among other things to classify two languages as sister languages or mother-daughter languages. So, to him, the study of Rig Veda was not merely the study of sanskrit, but also the study of Vedic culture also known as the Aryan culture.
In 1768, a French Jesuit, upon studying sanskrit concluded that Greek, Latin and sanskrit must have a common ancestor.
In 1780's, an English judge, one William Jones, sent to Calcutta to study native Indian laws turned into a sanskrit enthusiast.
Proponents of AIT/AMT who were confident that science would back their theory were taken aback.
These genetic studies also settled the debate on whether Indo-Aryans and Europeans were related. The R1a haplogroup  that is common among modern-day North Indians is also found in a significant population of the Europeans.