Date of birth of Ashikaga Yoshiyasu

[wiranobu]

Greetings, it's good to be back here after a while. My final paper for my bachelor's degree have been approved, but there are some revisions that my professor would like me to make before submitting it to the University press.

In the background of Sengoku Jidai I wrote (mostly quoted) about how the house of Ashikaga strengthened its hegemony through their bloodline ties to the Minamoto clan, and how Shiba, Hosokawa and Hatakeyama clans are related through Ashikaga Yoshiyasu

My problem is my professor at school is quite strict about the data authenticity, so he asked why I wrote Yoshiyasu lived from ?-1157 and I answered that I quoted the data as is (If I'm not mistaken it's from an Ashikaga family tree chronology from George Sansom's A History of Japan, without the year of birth. End of story, He was not satisfied with that and ordered me to get more data.

So I googled it and what I got is 1126-1157 AD (from here http://www.taiheiki42volume.com/Ashikaga--Main-Tree-.html). Is this correct? Any useful data will help!
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[lordameth]

The Asahi Nihon rekishi jinbutsu jiten (Asahi Encyclopedia of Japanese Historical Figures), Sekai dai-hyakka jiten (World Encyclopedia), and Nihon jinmei daijiten (Encyclopedia of Japanese Personages) all give the birth date as unknown.

http://kotobank.jp/word/%E8%B6%B3%E5%88%A9%E7%BE%A9%E5%BA%B7
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My blog on Japanese art & history: http://chaari.wordpress.com

紫水晶殿 - The Amethyst Lord