My reoccurring dream

I have been having a reoccurring dream over the last few weeks. I've had it at least a dozen times or more. Every time it is more detailed. So, because it has occurred multiple times I have decided to share it with you.

I am on a horse. The horse is mostly white, but for a light sprinkling of gray spots on his rump, the merest hint of gray above his hooves and a shock of gray emblazoned on his chest. I am wearing leather breeches with intricate embroidery in periwinkle blue. I have a small silver shield hanging from my saddle with the image of a dragon twisting around a unicorn raised up on its hind legs. In the image the dragon and the unicorn are not fighting; more like they are in harmony. I am wearing a helmet upon my head. I have a 14 inch broad sword in my left hand and I am holding the reins of my horse in my right hand. When the dream starts I am in full gallop, but as it moves forward I slow down to a fast canter. I am riding toward a small home. Outside the home a man and a woman are standing. The man has a sword in his hand and has it raised in a defensive position. The woman just stands there staring. As I ride up to the couple I sweep my helmet from my head and it falls clattering to the ground allowing my long red hair to flow freely behind me. When I am only about ten feet from the couple I leap off the left side of my horse and trade my sword into my right hand. I stride quickly toward the couple and in one smooth movement I use my sword to stab the woman once, violently, through the heart and then I swing my sword wide and slice her head from her body. Her body crumples to the ground and her head falls next to it. Then I raise my left hand, close my fist and open it again over her body. The instant I do that her body crumples into a black dust and blows away in the wind. The man stands there with his sword still in his hand staring in confusion at me and the black stain where the woman's body used to be. I look at him for a few moments and I get the feeling that I know him very well. I feel like I say something, but I have no idea what it is. I do know that I am crying because I can feel the tears running down my cheeks. Then I turn on my heel and walk back to my horse who is standing calmly a few feet away. I swing back up on my horse and turn leaving the man standing there. I have a deep sense of relief and simultaneous deep sadness as I ride slowly away. The wind whips at my hair and tears flow freely down my cheeks.
And then I wake up.

It is very vivid and truthfully it feels incredibly real. More like an ancient memory than a dream. I just wanted to share.