How did polities interact in the Archaic and Classical periods, and which norms influenced their behaviour? This chapter aims to answer these questions. By moving away from the dominant Realist interpretation of ancient history, and employing a variety of themes that played a role in neighbourly relations, a fresh and different understanding of neighbourly diplomatic interactions emerges. Four norms are investigated; first, the decision to go to war or avoid that possibility; second, friendship ties; third, reciprocity; and fourth, reputation. By analysing the reasoning behind the breakdown of neighbourly relations, it will become that clear political actors frequently sought ways to restore the status quo and peaceful co-existence. A second factor is the friendship ties between leaders and how this influenced the direction of the neighbours vis-à-vis one another. The third aspect is reciprocity, and how this formed a staple of neighbourly relations and could be called upon to reinforce neighbourly ties. Finally, the notions of reputation and trust are investigated to show that the reputation of a polis influenced neighbourly relations, whether positively or negatively. Earlier behaviour, such as abandoning an alliance, impacted decision-making and required significant efforts to restore the trust between the neighbours.