校長は

the principal

→ 校長
phrase Rare #19,845
the principal 校長 means “principal” or “headmaster,” and は marks it as the topic of the sentence. The phrase often begins a sentence describing what the principal does or is like.
JA: 校長は明日の予定を説明しました。
EN: The principal explained tomorrow’s schedule.

校長はどっちを信じるかな

I wonder which one the principal will believe.

— コーラス (2004)

校長はが嫌いです

The principal dislikes me.

— ムーンライズ・キングダム (2012)

うちの校長は学生とよく会ってくれる

Our principal often meets with students.

校長は全部承知

The principal knows everything.

— いまを生きる (1989)

校長は

What about the principal?

— Good Luck, Have Fun, Don't Die (2026)

校長はいるわ

The principal is here.

— サスペリア (1977)

校長は彼に無断欠勤理由をただした

The principal demanded that he explain his unauthorized absence.

校長は僕の横にやってきた

The principal came over and stood beside me.

— いまを生きる (1989)

校長は私に彼女が正直なのを保証した

The principal assured me that she was honest.

校長は卒業生一人一人と握手をした

The principal shook hands with each graduate.