His first great attempt at a public demonstration of his art was about 1630, which was to discover certain treasures which he claimed were buried in the cloister of Westminster Abbey. Lilly had studied astronomy with a Welsh clergyman, and doubtless may have been sufficiently "weather-wise" to anticipate a storm; but however that might have been, on the night of the attempt, there came up a most terrific storm of wind, rain, thunder and lightning, which threatened to bury the actors beneath the ruins of the abbey, and his companions fled, leaving Lilly master of the situation. He unblushingly declared that he himself allayed the "storm spirit," and "attributed the failure to the lack of faith and want of better knowledge in his companions." "In 1634 Lilly ventured a second marriage, with another woman of property, which was unfortunate as a commercial speculation, for the bride proved extravagant beyond her dowry and Lilly's income. In 1644 he published his first almanac, which he continued thirty-six years. In 1648 he therein predicted the "great fire" of London, which immortalized his name. While Lilly was known as a cheat, and was ridiculed for his absurdities, he received the credit for as lucky a guess as ever blessed the fortunes of a cunning rogue. "In the year 1656," said his prediction, "the aphelium of Mars, the signification of England, will be in Virgo, which is assuredly the ascendant of the English monarchy, but Aries of the kingdom. When this absis, therefore, of Mars shall appear in Virgo, who shall expect less than a strange _catastrophe_ of human affairs in the commonwealth, monarchy, and kingdom of England?" He then further stated that it would be "_ominous to London, unto her merchants at sea, to her traffique_ at land, to her poor, to her rich, to all _sorts of people inhabiting her or her liberties, by reason of fire and plague_!" These he predicted would occur within ten years of that time. The great plague did occur in London in 1665, and the great fire in 1666! The fire originated by incendiarism in a bakery on Pudding Lane, near the Tower, in a section of the city where the buildings were all constructed of wood with pitched roofs, and also a section near the storehouses for shipping materials, and those of a highly combustible nature. It occurred also at a time when the water-pipes were empty. This fearful visitation destroyed nearly two thirds of the metropolis. Four hundred and thirty-three acres were burned over. Thirteen thousand houses, eighty-nine churches, and scores of public buildings were laid in ashes and ruins. There was no estimating the amount of property destroyed, nor the many souls who perished in the relentless, devouring flames.