In the first year he built a monastery and appointed an abbot with monks. For the next two years he remained there in seclusion.
In that setting, divine holiness transported him to such a summit of perfection that, breathed upon by the Holy Spirit, he foresaw many future events and comprehended with the rays of his intelligence hidden mysteries of the Old and New Testament.
Frequently he was seized by so great a contemplation of divinity that he would be reduced to tears with the boiling, indescribable heat of divine love.
In this condition he would cry out: Beloved Jesus, beloved, sweet honey, indescribable longing, delight of the saints, sweetness of the angels, and other things of this kind.
We are unable to express the ecstasy of these utterances, dictated by the Holy Spirit. Wherever the holy man might arrange to live, he would follow the same pattern.
First he would build an oratory with an altar in a cell; then he would shut himself in and forbid access.
Finally, after he had lived in many places, perceiving that his end was near, he returned to the monastery he had built in the valley of Castro.
While he awaited with certainty his approaching death, he ordered a cell to be constructed there with an oratory in which he might isolate himself and preserve silence until death.
Accordingly the hermitage was built, since he had made up his mind that he would die there. His body began to grow more and more oppressed by afflictions and was already failing, not so much from weakness as from the exhaustion of great age.
One day he began to feel the loss of his physical strength under all the harassment of increasingly violent afflictions. As the sun was beginning to set, he instructed two monks who were standing by to go out and close the door of the cell behind them; they were to come back to him at daybreak to celebrate matins.
They were so concerned about his end that they went out reluctantly and did not rest immediately. On the contrary, since they were worried that their master might die, they lay hidden near the cell and watched this precious treasure. For some time they continued to listen attentively until they heard neither movement nor sound.
Rightly guessing what had happened, they pushed open the door, rushed in quickly, lit a candle and found the holy man lying on his back, his blessed soul snatched up into heaven. As he lay there, he seemed like a neglected heavenly pearl that was soon to be given a place of honour in the treasury of the King of kings.
Peter Damian (c.1007-1072): Life of St Romuald, chapters 39 and 61 @ Universalis.