その頃ころ

expression, noun, noun which may take the genitive case particle 'no'

at that time; in those days; then

Refers to a specific past time or period previously mentioned or understood from context. Can be used as a noun or adjectivally with の.

• その頃ころ、私わたしはまだ学がく生せいでした。

  At that time, I was still a student.

• その頃ころのことはよく覚おぼえていない。

  I don't remember much about those days.