The antique origin of Roccamontepiano dates back, with no doubts, to the High Middle Age, period of  invasions from the North Europe populations (overall Longobards) and the monastic Benedectine-Cassinese expansion. This was the epoch in which, around the near Monastery of St. Liberator of Majella (Serramonacesca on the provincial Territory of Pescara) the fiefs of Pomaro, San Pietro, Sant'Angelo and Polegra coexisted.

In a second time such properties were transferred to St. Liberator, which edified churches and Monasters. Concerning "The old Rock", destroyed from the tremendous landslide on June 24, 1765, it appears, for the first time, in the maps compiled by the Arabian geographer Al Idrisi, for King Ruggero d'Altavilla, in the second half of XII century with the name of  "Ruqqa N Lan", while  in other documents of 300 it was called "Rocca Montis Plani" or "Rocca De Monte Plano".

The process of encastellation happened after many centuries. Only in the documents of 500, the fiefs were declared as uninhabited, and consequently the entire centre perched around the main castle constituted "The Monte Piano Rock", after completely destroyed. The current centre is different from the antique structure; just the Monastery of St. Peter (see picture), the Monastery of St. Francis, the Church of St. Rocco, the little church of the Virgin of the Snow and the Bourge Church of Our Lady of Graces survived to that cataclysm. 

The landslide destroyed the whole village, causing more than 500 victims and determining a subsequent irregular reconstruction of the buildings on the communal territory, in a way that the same town planner has defined it as a garden village.