Wikipedia’s first three press releases (2002, 2003, and 2004), including two that I had nothing to do with, all credited me as founder. It was not until later, in 2004 that Jimmy Wales began omitting mention of my involvement at the start of Wikipedia to the press, and he didn’t start denying that I am co-founder until 2005 or 2006, just when Wikipedia began to enter the public eye.
Here is Sangers collection of "evidence".
http://blog.larrysanger.org/role-in-wikipedia/my-role-in-wik...
I find this paragraph most interesting.
Wikipedia’s first three press releases (2002, 2003, and 2004), including two that I had nothing to do with, all credited me as founder. It was not until later, in 2004 that Jimmy Wales began omitting mention of my involvement at the start of Wikipedia to the press, and he didn’t start denying that I am co-founder until 2005 or 2006, just when Wikipedia began to enter the public eye.