Relic

n. remnant, item that remains from a past era; bones of the dead (especially of a religious martyr); souvenir, memento

A relic is an object, especially a piece of the body or a personal item of someone of religious significance, carefully preserved with an air of veneration as a tangible memorial. Relics are an important aspect of Buddhism, some denominations of Christianity, Hinduism, shamanism, and many other personal belief systems.
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Noun
1. an antiquity that has survived from the distant past
(hypernym) antiquity
(hyponym) archeological remains
2. something of sentimental value
(synonym) keepsake, souvenir, token
(hypernym) object, physical object
(hyponym) love-token

(n.)
The body from which the soul has departed; a corpse; especially, the body, or some part of the body, of a deceased saint or martyr; -- usually in the plural when referring to the whole body.
  

(n.)
That which remains; that which is left after loss or decay; a remaining portion; a remnant.
  

(n.)
Hence, a memorial; anything preserved in remembrance; as, relics of youthful days or friendships.
  

A holy object or portion of a holy object that maintained a mystical connection with the holy. There were many false relics pawned during the Middle Ages, forgeries no different from the art fakes now sold. Relics were often used to swear upon, perhaps the bones of a saint, a portion of the True Cross, or some such was touched in the impromptu ceremony of an oath. Relics were also incorporated into other objects with the hope that the connection with the holy would transmit something of that holy character to the larger artifact. Swords sometimes worked relics into the pommels and in churches, altars were contained some object thought to be a relic.