Archbishop of Canterbury Justin Welby made the short journey from Lambeth Palace to Bricklayers Arms on Tuesday morning to visit St Saviour's and St Olave's School.
Archbishop Justin Welby took part in a discussion with 20 pupils at the Church of England girls' school.
He shared stories from his experience of peace-making and reconciliation in war zones, and answered their questions about solving conflict in their own lives and in the wider world.
Earlier he addressed the school's morning assembly on the topic of reconciliation, and prayed for and blessed the students.
The Archbishop was joined at the school by Simon Hughes MP and the Dean of Southwark, the Very Revd Andrew Nunn.
"Reconciliation is not about everyone agreeing," the Archbishop told pupils. "We may disagree – but let's disagree lovingly.
"Jesus said love one another – love your neighbour and love your enemy.
"As far as I can tell there's nobody left out of that.
"So we can disagree well and listen to each other and learn from each other."