Regarding the vampire ancestor, the most said are Cain, Lilith, and Dracula.
Cain, first recorded in the Old Testament book of Genesis in the Bible, was one of Adam and Eve's two sons, he was a farmer, and then because he was jealous of his brother Abel killing him, God cursed him and punished him for wandering the world, and Cain has little to do with vampires in the books.
The claim that Cain is the ancestor of vampires does not come from the Bible, but from the background of "Vampire" of the tabletop RPG "Dark World" produced by White Wolf Games around the 90s of the last century. Even the so-called "Vampire Bible" - Book of Nod, which has been circulating on the Internet for a long time, is just a game setting guide produced by White Wolf.
"Dark World" has a very detailed setting for many fantasy creatures such as vampires, werewolves, etc.
Lilith, believed to be Adam's ex-wife, the world's first woman. In the Ten Commandments, God tells Lilith that your power is arranged and will never surpass Adam. So Lilith left the Garden of Eden in search of strength and came to the Red Sea, which is actually Earth. Later God abandoned Lilith and created Eve instead of Lilith with Adam's ribs.
Lilith's birth is not recorded in the Bible. Lilith was first published in "Sumerian Mythology", in which Lilith is the lover of the demon king Satan, and the title - the witch of the night.
Cain wandered around the world and reflected, and also came to the Red Sea (Earth). Meeting Lilith, who is also in the Red Sea (Earth), Lilith teaches him to use blood to gain great power, and the two create the second generation of the blood clan, and the second generation of the blood clan creates the third generation of the blood clan, that is, the thirteen clan. This is also a widely accepted statement, Cain and Lilith are both vampire ancestors, and Lilith is the first vampire.
After Cain left, Lilith was left alone in the Red Sea (Earth) to continue her quest for power. At that time, God removed the archangel Lucifer from his position, and Lucifer was not convinced, and directly gathered all the blazing angels to launch a three-day angelic war, and finally lost the battle and fell into hell.
When she fell into hell, she pulled Lilith down in the Red Sea (Earth), where Lilith met the demon king Satan and gave birth to countless little demons.
After Lilith left the Garden of Eden privately, God sent three angels to hunt Lilith, and God told the angels to kill 100 of her descendants every day if Lilith did not return. Lilith disobeyed God's arrangement, so she led the little demon to devour babies at night, not only for revenge, but also to provide for the sea of blood (that is, female menstrual blood, which can give birth to all things).
This is the origin of the Night Witch and the reason why Lilith is considered the ancestor of vampires.
Lilith
As for Dracula, it is the most well-known among the people, mainly because at the end of the nineteenth century, the immortal masterpiece "Dracula" came out; Part of the reason is that he was born out of real historical figures.
Dracula's image, presumably, was born out of the famous European historical figure - Vlad III.
Dracula, a count of the Duchy of Wallakia, was sent to Constantinople in the Ottoman Empire as a hostage at the age of twelve, and his six-year imprisonment and the death of his relatives made Dracula bitter and brutal. At the age of seventeen, he led an army back to Wallachia and regained power with the support of the Turkish sultan, and the first thing he did when he came to power was to purge dissidents, harsh methods, and use all kinds of harsh punishments to deal with criminals and rebuild the country.
He stripped more than 20,000 captured Turkish soldiers naked and pierced them with stakes through the anus of living people and out of their mouths, erecting them outside the castle, known at the time as "Piercing Dracula".
Dracula's bloody brutality scared off the mighty Turkish army. But Count Dracula's bloodthirsty brutality also spread throughout Europe, and in the continuous circulation, he eventually merged with the legendary vampire.
Early books on vampires show that vampires just like to be nocturnal for a long time, but they are not afraid of sunlight.
A vampire is a cursed creature (an unexplained disease at the time), and sucking blood is the way to relieve the curse, or else fall into a permanent slumber. It's like charging a mobile phone, when the battery is gone, the phone will be shut down with a black screen, but it is not broken.
As for sucking human blood, because the cause of the curse of the vampire ancestor was because of betrayal or killing of humans.