In a sneak preview of the book, here are

The apostles sported beards of distinction, as illustrated in this image of St. Peter and Paul

Charles Dickens brought the goodness and Christmas together in his "A Christmas Carol". 

Abe Lincoln grew a beard on behest of a young girl, who told him bearded men are more trustworthy and.... promptly won a close election.

Alaric (b. 370). Chief of the Visigoths who sacked Rome, which lead to the fall of the Western Roman Empire.

Atilla the Hun (406-453). A ruthless barbarian ruler who was King of the Huns from 434 to 453 and wore an ill-kempt, straggly beard.

Barbarossa (d. 1546). Alias Redbeard, a ruthless Barbary Pirate who became an admiral of the Ottoman fleet.

Blackbeard (Edward Teach) (1680-1718). Famous pirate said to have had whiskers up to his eyes, woven with ribbons.

Henry VIII (1491-1547). Broke from the Roman Catholic Church in 1534. Perhaps best-known for killing wives who could not provide him with a male heir (though the fault, as any geneticist will tell you, was his own).

Bluebeard. Homicidal husband in Charles Perrault’s La Barbe Bleue. His grisly tale may have been based on the story of boy-killer Gilles de Rais, a 15th-century French marshal, or Comorre the Cursed, a 6th-century Breton chief.

Cardinal de Richelieu (1585-1642). Scheming chief minister to Louis XIII, known as the Red Eminence, and an ongoing aggravation to the Three Musketeers.

Ho Chi Minh (1890-1969). Goatee-wearer and founder of the Indochina communist party in 1930 whose regime in Vietnam in the 1950s became repressive and totalitarian.

Judas Iscariot. The apostle who betrayed Jesus Christ with a kiss for thirty pieces of silver. His beard was said to be red.

James, Jesse (1843-1915). Greatest outlaw of the American West.

Genghis Khan (1162-1227). Mongolian war-lord and famous conqueror. Same fashion-sense as Atilla.

Hitler, Adolf (1889-1945). Der Fuhrer who became dictator of Germany in 1933. His “new order” called for the extinction of gays, Jews, Romani (commonly but incorrectly called gypsies), and the mentally or physically handicapped. Is said to have copied Charlie Chaplin’s moustache style.

Hussein, Saddam (b. 1937). War-mongering president of Iraq since 1979 who launched an invasion of Iran in 1980 and of Kuwait in 1990. According to residents of South Park, is the lover of Satan.

Valentin Rasputin - debaucher, sex addict and a power hungry "Eminence Grise" behind the Russian throne 

bin Laden, Osama (b 1955). Contemporary extremist Islamic terrorist implicated in the September 2001 destruction of New York’s World Trade Centre.

Ivan IV (Ivan the Terrible) (1533-1684). Established a full autocracy in Russia and was known for his cruelty, cunning, and love of torture. Killed his own son.