While it may sound like something out of a science fiction novel, the concept of fairy bloodlines among the human population dates back to Celtic folklore. Celts believed that there were certain members of their royal family that possessed fairy blood elevating them to a higher status in their society. Not only were they a member of the royal family, but they were tasked with the important job of protecting this unique royal blood both for the future of their family as well as to safeguard the future of the human population as a whole.
As this bloodline continued to grow and develop, their story was shared across the lands. Various cultures and religions picked up on the folklore surrounding their gift, desiring to marry into the bloodline in hopes of also being blessed by their gift.

Source: Patheos
The fairies as depicted in ancient Celtic folklore was very different from the tiny, magical, winged creatures that come to mind today. They could often pass as human, being of the same size and shape, however, they possessed magical powers and appeared to never age. The didn’t have wings or other obvious physical differences, allowing them to walk among humans undetected. The Welsh even believed that fairies were also mortal, however, their lives lasted much longer than that of their human counterparts, often living hundreds or thousands of years.
As these fairies traveled freely among us, it is no surprise that tales exist of romantic connections developing. In many cases, it is said, humans weren’t even necessarily aware that their partner was a fairy! If these relationships resulted in a child, it would go one of two ways: A child born of a human mother and a fairy father appeared human, however, they likely possessed the magical abilities of a fairy handed down from their father. A child born of a fairy mother and a human father was, instead, born in the fairy world and was described as being ‘ethereal’.

Source: Exemplore
Other stories were shared of fairies who would steal the child of a human couple leaving, in its place, a fairy baby. The parents, unaware that the swap had occurred, would raise a child with abilities that they may not be able to explain. These children are known as ‘changelings.’ Venturing into a more energy based explanation, some believe that those who carry fairy blood are created when our souls are called to our body. Due to some mystical confusion or error, instead of simply drawing a human soul and placing it into the body, a fairy soul is transported.
Regardless of how this comes to be, the blessings and honors of descending from a fairy bloodline have been passed down from generation to generation. Do you believe that you may have been born with this magical blood flowing through your veins?
Here Are 15 Signs That You Descended From A Fairy Bloodline: