This is the 10744th most frequent Korean word.
권했고
"권했고" means "recommended" or "suggested."
권했고 is from 권하다, meaning 'to recommend or suggest', and here it is used in past tense to indicate an action of recommending.
그는 나에게 한국 음식을 먹어보라고 권했고, 나는 그 제안을 받아들였다.
He recommended me to try Korean food, and I accepted his suggestion.
권했고, a past tense form of 권하다, emphasizes that the suggestion or recommendation had occurred.
친구는 내가 이 책을 읽어보라고 권했고, 나는 흥미를 느껴 읽기 시작했다.
My friend suggested that I read this book, and I found it interesting and began reading.
Here, 권했고 portrays that the action of advising or recommending was done by the doctor in the past.