Why did Voldemort think Snape was the owner of the Elder Wand?

Voldemort knew that Snape had killed Dumbledore and thereby assumed Snape was its owner, so he killed Snape to take ownership. However, Draco Malfoy had already disarmed Dumbledore (though D kinda let him) thus defeating him and obtaining ownership of the Elder Wand.

Did Voldemort know Dumbledore had the Elder Wand?

It was only during the confrontation in Grindelwald’s cell that Voldemort learned Albus Dumbledore had claimed the wand in a duel decades back. However, Voldemort deduced that Dumbledore, who had defeated Grindelwald, had won the Elder Wand, and headed off to his grave.

How did Voldemort find out Dumbledore had the Elder Wand?

Voldemort broke into the prison Nurmengard Castle, where Gellert Grindelwald was being held, and demanded to know the location of the Elder Wand. It was only during the confrontation in Grindelwald’s cell that Voldemort learned Albus Dumbledore had claimed the wand in a duel decades back.

Did Voldemort know Dumbledore was the last person to wield the Elder Wand?

We also know that Voldemort knew that Dumbledore was the last person to wield the Elder Wand with its full allegiance because he killed Snape in an attempt to inherit that allegiance from him, who he assumed inherited it from Dumbledore. Now Voldemort is no idiot.

What did Voldemort know about Grindelwald?

We know that Voldemort knew that Grindelwald was not killed by Dumbledore, as he himself killed Grindelwald. We also know that Voldemort knew that Dumbledore was the last person to wield the elder wand with its full allegiance because he killed Snape in an attempt to inherit that allegiance from him, who he assumed inherited it from Dumbledore.

Was Dumbledore’s death planned between Snape and Snape?

Dumbledore’s death was planned between them! Dumbledore intended to die undefeated, the wand’s last true master! If all had gone as planned, the wand’s power would have died with him, because it had never been won from him!” Dumbledore made a plan with Snape, for Snape to kill him.

Does Voldemort feel any remorse for killing Snape?

By killing someone, you make sure you have defeated someone for now and ever. Furthermore it doesn’t look like Voldemort is having problems with killing just one more: he doesn’t feel any remorse. He always has seen his “servants” and by extent Snape as “tools” to complete his task.