i can suggest many. pro tip, avoid history books written by ethiopians it's highly biased! read books written bh foreign scholars

Read books before the past 50 years especially king chronicles and ፀኃፌ ትዕዛዝ books. ተክለ ፃድቅ መኩርያ ጳውሎስ ኞኞ are great writers...most foreign writers are biased and writing to demolish African history

https://www.goodreads.com/review/list/99743457-eyob?ref=nav_mybooks&shelf=ethiopia