Napisani su 1800tih godina dok je, još uvek, bio živ. Oni obuhvataju informacije o njegovom životu i o postojanju vampira u Mystic Falls. Elena, Jeremy, Anna i Alaric su čitali ove dnevnike.
Dnevnici su prvi put bili pomenuti Jeremyju od strane Jenne kad je rekao da treba da uradi zadatak iz istorije. Nalazili su se u ormaru, u staroj sobi njegovih roditelja. Jeremy je kasnije napisao dodatni sastav o postojanju vampira uz Anninu pomoć.
Alaric je pitao da pozajmi dnevnike s željom da sazna više informacija o vampirima. Posle je Anna želela da ih pozajmi kako bi pokušala da sazna kako da otključa vampirsku grobnicu i pitala je Jeremyja da li može da joj ih pozajmi. Kada je Noah namerio da ubije Jeremyja i kad je zabrljao sa Elenom, Stefan i Damon su mu tražili informacije o tome kako se otključava grobnica. On im je otkrio da se u dnevnicima krije informacija gde se nalazi Emylina knjiga vradžbina i nakon toga su ga ubili. Pokušali su da nađu dnevnike, ali oni su još bili kod Alarica. Alaric je fotokopirao knjige i posle toga mu ih je Anna ukrala. Kasnije je Stefan ukrao Alaricu fotokopije koje je ovaj napravio.
U Crying Wolf, Elena o Stefan nalaze još puno dnevnika skrivenih u tajnoj sobi u kući na jezeru.
Ono što je Johnathan zapisao:
*Very cold last night but the sun shines out now, warm and brightly today. Considerable ice running in the ... a very small school today. Some are sick and some are taking a new year holiday. I have never ... been so unsettled about the fortunate...
*I met Barnette and Giuseppe this evening. I saw the skepticism in their eyes when I showed them the compass.
*I saw her again today, the most beautiful woman in town with a name just as pretty - Pearl.
*The Fell Family believed it should be I, not them, who protected the witch's spell book. But I feared she would haunt me from the hereafter. They mocked my fear but it was Giuseppe Salvatore who removed my fear. He told me he would protect the secret of the spell book. He said he would carry it to his grave.
*With the dying embers of the fire at Fell's Church, the scourge of the vampires had passed. And though war raged all around us, our town was safe from the demons of the night. Or so we thought. The monsters we drove to their fiery deaths had begat new monsters.
*I knew I was about to die. You can not run from a vampire. I saw the vampire who killed me. I recognized him. It was Stefan Salvatore.
*He did not reply ... around him and up and down, as though ... He did not reply for a moment but looked all around him, and up and down, as though he Pulled open his shirt and with his long (unclear) opened up a vein in his breast. I thought I would improve the occasion and learn something, so I asked him, "What about the ... ?"
*The wood from one tree and one tree alone, an ancient white oak, would bring death to an Original vampire. When the tree burned, all hope was thought lost...But the ash from the tree was saved, and witches forged a dagger to which the ash could be bonded. This alchemic bond provided the necessary poison to kill an original vampire It must be brandished by humans alone, for it will bring death to all demons who wield it. Originals believed in truth and honor. It was forbidden for a vampire to kill another vampire. So the dagger would take both lives. And so long as the dagger stays in place, the Original, for all intents and purposes, is dead.
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