From before the foundations of the world...

[judge]

IMHO the diatessaron was made from the peshitta. So the peshitta came first. You can see some of the reasons I came around to this view here.

Conclusion: The peshitta predates the distessaron

Reasons: ??? (I invite you to look outside the forum for at least one of the reasons)

What would you like me to look at in particular. As I mentioned I have been actively investigating this topic for 8 years or so.

If you have some evidence that the diatessaron predates the peshitta, then I am all ears.