King Rhoam's Journal is an item from The Legend of Zelda: Breath of the Wild. Link can find Rhoam Bosphoramus Hyrule's Journal in the Library inside Hyrule Castle, hidden behind a part of a bookshelf that can be pulled out using Magnesis Rune.
"Today, as the sun rose and a new day was born, my daughter, too, joined this sweet world. In keeping with the traditions of the royal family, I have decided to name her...Zelda. I am not a man accustomed to frivolous musings, but now seems as good a time as any to begin my royal memorandum. "
"Reports keep arriving regarding the excavation of relics. The fortune teller's predictions seem to be coming true. Calamity Ganon was not a figure of fable, or even of legend. He actually existed in our great land of Hyrule. We must investigate all the relics, learn as much as we can. But understanding the Divine Beasts alone will take time... Zelda's eyes lit up like a wildfire when I told her about the relics... I must admit, she has a knack for research."
"My queen has left this world. Her death was so sudden and unexpected, I awaken most nights unsure if she is really gone. Zelda never cried, never faltered. Not even during the royal funeral or later when she and I were alone with our grief. I must assume her strength is a result of us repeatedly informing her of her duty to be a valiant and steady princess. For a child of merely six years of age, her conduct was truly that of a born leader. Her strength gives me hope. From now on, I must raise her all alone... Now, only I remain to prepare her for her difficult future as princess of Hyrule."
"Zelda finally reported back after her visit to the fountain. It seems her sacred sealing power has still yet to awaken. It has been a year and three months since her mother passed. Perhaps she is held back by heartache too deep to heal. If the Ganon prophecy wasn't looming over our heads, I would tell her to take her time... To wait until she is ready. But our situation is dire and leaves no room for weakness—even on behalf of my beloved daughter. My heart breaks for Zelda, but I must act as a king, not a father. I must order her to train relentlessly at the fountain."
"I was told Zelda went off to research ancient technology, so I had no choice but to confront her about it. She claims she was simply using her day off from training to indulge in a bit of research, but still I scolded her. She won't get it through her head... Forcing me to tell her the same thing I have been repeating ad nauseam. The reason her sacred powers still won't awaken is because she's spending all her efforts playing at being a scholar!"
"In truth, I understand Zelda's feelings. Painfully so. She lost her mother, her teacher, before she could learn from her. Ten pointless years of self-training, without so much as a book or note to help her find her way... Those in the castle talk behind her back. And I, her only family, scold her for her shortcomings. No wonder she wishes to hide away in her beloved relic research. I'd love nothing more than to console her... But I must stay strong. She MUST fulfill her duty, just as we all must. Even if she comes to despise me."
"I have been told my Zelda went to the Spring of Wisdom... This will likely be her last chance. If she is unable to awaken her power at Lanayru, all hope is truly lost. If she comes back without success, then I shall speak kindly with her. Scolding is pointless now. I forced 10 years of training on her... and after all that, it seems her power will stubbornly awaken some other way. Perhaps I should encourage her to keep researching her beloved relics. They may just lead her to answers I can't provide. For now, I sit anxiously, more a father than a king in this moment. I sit and await my daughter's return."