one's John Hancock

one's John Hancock
这是“亲笔签名”的意思,来源于哪里呢?还有“A Pyrrhic Victory”这又是来源于哪个典故呢?
有没有详细一点的英文资料？

one's John Hancock = 你的签名.
The signature of John Hancock on the Declaration of Independence is the most flamboyant and easily recognizable of all.It is perhaps no surprise that the story of his part in the revolution is equally engaging.Few figures were more well known or more popular than John Hancock.
Born in Braintree,Massachusetts in 1737,he was orphaned as a child,and adopted by a wealthy merchant uncle who was childless.Hancock attended Harvard College for a business education and graduated at the age of 17.He apprenticed to his uncle as a clerk and proved so honest and capable that,in 1760,he was sent on a business mission to England.
There he witnessed the coronation of George III and engaged some of the leading businessmen of London.In 1763,his uncle died and John Hancock inherited what was said to be the greatest body of wealth in New England.
This placed him in a society of men who consisted mainly of loyalists,suspected by the working population because of their great affluence and social power.
Hancock,however,soon became very involved in revolutionary politics and his sentiments were,early on and clearly,for independence from Great Britain.
因为美国开国独立宣言一纸上,签名的字特别大和签字美,故后人用 John Hancock 来话签名的字.
A Pyrrhic Victory = 虽胜但仍遗失惨重.
A Pyrrhic victory is a victory with devastating cost to the victor.The phrase is an allusion to King Pyrrhus of Epirus (ancient Greece),whose army suffered irreplaceable casualties when he defeated the Romans during the Pyrrhic War at Heraclea in 280 BC and Asculum in 279 BC.