Two swords are presented in the Arthurian Legends: Excalibur (also called Caliburn) and the Sword in the Stone. Sometimes people think it’s one and the same, but more and more it is believed that they are not. 

The Sword in the Stone
The story of the Sword in the Stone is a story about Arthur’s claim to the throne of Britain. According to legend, the Sword was Uther’s sword, the sword of the High King of Britain. After Uther’s death there is no known heir and the barons are fighting among each other who is to be the next High King of Britain.
Merlin, who was Uther counselor, has the sollution: he takes Uther’s sword and with his magic, he runs it into a rock. The onw man who is able to draw the sword from the stone again will be the rightfull heir. Many have tried: Lot, Uriens, even Leodegrance and many more, but no one was able to draw the sword.
Until one day Sir Ector and his sons Kay and Arthur (not knowing he is not Ector’s real son but fostered by him) come to the place where the sword is captured in the rock, they come for a tournament. Arthur, being squirl to Ector and Kay, has to get Kay a new sword for his one is broken. He passes the rock and draws the sword, which he brings to Ector and Kay. Next, confusion is great, for how could this boy draw the sword from the stone.
Then Merlin makes his entrance again and declares that Arthur is Uther’s son. To proof that he places the sword back in the stone and dares anyone to draw it. Again no one succeeds, but Arthur. And so he became High King of Britain at a very young age. 

Excalibur
Excalibur is the sword Arthur receives from the Lady of the Lake. She sometimes is a mythical figure - an ancient Welsh goddess of water, and sometimes she’s referred to as a highpriestess of Avalon. In both cases she a Lady with great power.
Her giving the sword of magic (presumebly made by an elven smith) is her acceptance as Arthur as protector of Britain. The sword and scabbard are enchanted: the scabbard protects the owner from being mortily wounded and the sword is supposed to be unbreakable. 

Names for Excalibur
The emythology of the name is some what confusing for it is also said that the Welsh name for Excalibur was Caladvwlch, equating linguistically with Irish Caladbolg, the name of a sword borne by heroes in Irish legend, derived from CALAD (hard) and BOLG (lightning). It goes with a story in which the sword is struck by lighting just as the (elven) smith takes it out of the water after its final heating.
Caladbolg is also known as the sword of the Welsh legend Cu Chullain (see ‘Morrigan’ and ‘Celtic literature’ in the celtic section). Caliburn is also supposed to be the old Welsh name for the sword, which was later transformed to ‘Excalibur’ by French poets like Chretien de Troyes. It is supposed to mean ‘Cuts steal’.
Two different names and different meanings to one and the same sword, or is it?

http://www.missgien.net/arthurian/excalibur.html


Then read this, I promise you’ll find the connection

John 1: 1-3

In the beginning was the Word [Christ], and the Word was with God, and the Word was God. He was in the beginning with God. All things came into being through Him, and apart from Him nothing came into being that has come into being.

Col 1:16

For by Him all things were created, both in the heavens and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things have been created through Him and for Him.

Gen 1:25-27

God made the beasts of the earth after their kind, and the cattle after their kind, and everything that creeps on the ground after its kind; and God saw that it was good. Then God said, “Let Us make man in Our image, according to Our likeness; and let them rule over the fish of the sea and over the birds of the sky and over the cattle and over all the earth, and over every creeping thing that creeps on the earth.” God created man in His own image, in the image of God He created him; male and female He created them.

Narrative

Everything was good with man, and between man and God. God provided all their needs. Continual fellowship with God was their joy. God had given them everything they needed for complete fulfillment. He cared for them as a loving mother would her newborn baby:

Gen 1:28-31

God blessed them; and God said to them, “Be fruitful and multiply, and fill the earth, and subdue it; and rule over the fish of the sea and over the birds of the sky and over every living thing that moves on the earth.” Then God said, “Behold, I have given you every plant yielding seed that is on the surface of all the earth, and every tree which has fruit yielding seed; it shall be food for you; and to every beast of the earth and to every bird of the sky and to every thing that moves on the earth which has life, I have given every green plant for food”; and it was so.

Gen 2:25

God saw all that He had made, and behold, it was very good. And the man and his wife were both naked and were not ashamed.

http://www.riverpower.org/Jesus_story.htm
 

Norse God? Really? Another connection?

Once upon a time it happened that Thor’s hammer [Mjolnir] fell into the possession of the giant Thrym, who buried it eight fathoms deep under the rocks of Jotunheim. Thor sent Loki to negotiate with Thrym, but he could only prevail so far as to get the giant’s promise to restore the weapon if Freya would consent to be his bride. Loki returned and reported the result of his mission, but the goddess of love was quite horrified at the idea of bestowing her charms on the king of the Frost giants. In this emergency Loki persuaded Thor to dress himself in Freya’s clothes and accompany him to Jotunheim. Thrym received his veiled bride with due courtesy, but was greatly surprised at seeing her eat for her supper eight salmons and a full grown ox, besides other delicacies, washing the whole down with three tuns of mead. Loki, however, assured him that she had not tasted anything for eight long nights, so great was her desire to see her lover, the renowned ruler of Jotunheim. Thrym had at length the curiosity to peep under his bride’s veil, but started back in affright and demanded why Freya’s eyeballs glistened with fire. Loki repeated the same excuse and the giant was satisfied. He ordered the hammer to be brought in and laid on the maiden’s lap. Thereupon Thor threw off his disguise, grasped his redoubted weapon, and slaughtered Thrym and all his followers.Just in case you don’t “believe” yet. 
Read through these.
http://www.mainlesson.com/display.php?author=mabie&book=norse&story=thor
http://www.mackaos.com.au/Articles/Mjol.html
So let me tell you what I beleive. Our God’s are races that have flourished longer than ours and they’re out there in the Universe. If you just open your eyes and look at everything with detail, there is a reason. And it’s because of Alien life forms that we are as blessed as we are.