Headmaster Aydin Önaç told Mrs Gewolb that the school was “simply hosting the competition”.
He added: “I know that the organisers were very careful to use the term ‘mark’ rather than ‘celebrate’ [the centenary] so as not to predetermine any bias in submissions.”
Mr Önaç said that as the competition had been “underway for some time” there was no need to change the guidelines.
But when contacted by the JC on Wednesday, the headmaster said the school was no longer hosting the event. He declined to comment further.
Mrs Gewolb said: “Any responsible project, which a school promotes to its students, needs to promote peace and a two-state solution. This poetry competition does not meet these needs.”
St Olave’s hit the headlines last month for excluding pupils who failed to get top grades in AS-level exams .