Voldemort went after Lily Potter (and James) because of a prophecy stating a boy born at the end of July, whose parents had defied him thrice, would have the power to defeat the Dark Lord, leading him to target baby Harry; Lily's protective love for Harry, which created powerful ancient magic, was the key reason he couldn't kill Harry, but he killed her because she stood in his way, refusing to step aside.
After graduation, Snape decided to side with Voldemort because he was delusional and believed that he would impress Lily if he gained power as a Death Eater. He looked down on Muggleborns, but thought that Lily was the "exception" (or maybe not, since he called her a Mudblood), which he was completely wrong about.
Voldemort believed that the Potter child was the real threat and decided to go after them first, most likely planning to target the Longbottoms afterward. Snape learned of Voldemort's intentions and begged him to spare only Lily Potter. Voldemort said he would spare her as long as she did not interfere.
Snape's tears, containing his memories, become the means for Harry to understand the professor's sacrifice, his love for Lily, and the necessity of facing Voldemort with the truth. While giving his tears was an impulsive act, it also symbolized his loyalty and dedication to Lily Potter's memory and Dumbledore's plan.
It wasn't revenge, because Snape turned before Lily's death, and he blames himself more than anything for what happened. The triggering event was Lily being threatened yes, that's what made him go against Voldemort and risk his life doing so.
Despite Snape killing Dumbledore, it is learned that they had a special agreement for him to do so. When he died, it was revealed that his deep strong love for Lily Evans caused him to redeem himself, joining Dumbledore's cause for her protection (and, after her death, that of her son) from Lord Voldemort.
remember my last, petunia. " Dumbledore is referring to his last letter, which means, of course, the letter he left upon the Dursleys' doorstep when Harry was one year old.
He viewed Snape as loyal so rather than kill him by his own hand, he gave Nagini the kill. Voldemort believed that Snape had to be killed to make the elder wand work, since Snape killed Dumbledore.
Following her defeat, Delphini was presumably imprisoned in Azkaban, most likely for the charges of murder and abuse of forbidden relics.
~~~~~ Sevrus Snape Fact ~~~~~ Since Snape was a half blood and Lily was muggle born it put his friendship with Lily under great strain, but their friendship was broken in their 5th year when Snape called Lily a mudblood and she never forgave him for that.
J.K. Rowling apparently confirmed that Lily Potter was pregnant again when Voldemort murdered her | Fandom. Thus, in murdering the Potters, save for Harry, Voldemort also killed a younger brother or sister that Harry would ultimately never know before it was even born.
Because some snakes could sense heat and movement in a way humans could not, Nagini was able to detect Harry and Hermione even when they were under the Cloak of Invisibility.
He trusted snape because snape had proven himself many times before. Voldemort took anyone that was magical and had his own ideas in common during his first crusade.
Harry is the heir of Gryffindor, although he had characteristics of both Slytherin (cleverness, resourcefulness, determination) and Gryffindor (bravery, honor, recklessness, chilvary). It is why Harry was able to claim the Sword of Gryffindor.
She was even more shocked to discover that she could speak with it. She was a Parselmouth, a descendant of Salazar Slytherin, through a squib line.
Salazar Slytherin
For many years, all was well among the four founders. Yet when shrewd Salazar Slytherin, 'from fen', suggested that only those from magical families deserved to come to Hogwarts, his three friends stood against him. Salazar Slytherin left the school.
In both the Harry Potter and the Deathly Hallows book and film, Hedwig dies during the Battle of the Seven Potters. In the book, Hedwig is hit by a random Avada Kedavra and instantly dies. In the movie, Hedwig is killed because she was trying to protect Harry.