Abraham Ortelius (; also Ortels, Orthellius, Wortels; 14 April 1527 - 28 June 1598) was a Flemish cartographer and geographer, conventionally recognized as the creator of the first modern atlas, the Theatrum Orbis Terrarum (Theatre of the World). Ortelius is often considered one of the founders of the Netherlandish school of cartography and one of the most notable representatives of the school in its golden age (approximately 1570s-1670s). The publication of his atlas in 1570 is often considered as the official beginning of the Golden Age of Netherlandish cartography.
Theatrum Orbis Terrarum
On 20 May 1570, Gilles Coppens de Diest at Antwerp issued Ortelius' Theatrum Orbis Terrarum, the "first modern atlas" (of 53 maps). Three Latin editions of this (besides a Dutch, a French and a German edition) appeared before the end of 1572; twenty-five editions came out before Ortelius' death in 1598; and several others were published subsequently, for the atlas continued to be in demand until about 1612. Most of the maps were admittedly reproductions (a list of 87 authors is given in the first Theatrum by Ortelius himself, growing to 183 names in the 1601 Latin edition), and many discrepancies of delineation or nomenclature occur. Errors, of course, abound, both in general conceptions and in detail; thus South America is initially very faulty in outline, but corrected in the 1587 French edition, and in Scotland the Grampians lie between the Forth and the Clyde; but, taken as a whole, this atlas with its accompanying text was a monument of rare erudition and industry. Its immediate precursor and prototype was a collection of thirty-eight maps of European lands, and of Asia, Africa, Tartary and Egypt, gathered together by the wealth and enterprise, and through the agents, of Ortelius' friend and patron, Gillis Hooftman (1521-1581), lord of Cleydael and Aertselaer: most of these were printed in Rome, eight or nine only in the Southern Netherlands.  In 1573 Ortelius published seventeen supplementary maps under the title Additamentum Theatri Orbis Terrarum. Four more Additamenta were to follow, the last one appearing in 1597. He also had a keen interest and formed a fine collection of coins, medals and antiques, and this resulted in the book (also in 1573, published by Philippe Galle of Antwerp) Deorum dearumque capita ... ex Museo Ortelii (reprinted in 1582, 1602, 1612, 1680, 1683 and finally in 1699 by Gronovius, Thesaurus Graecarum Antiquitatum. vol. vii).  The Theatrum Orbis Terrarum inspired a six volume work entitled Civitates orbis terrarum edited by Georg Braun and illustrated by Frans Hogenberg with the assistance of Ortelius himself, who visited England to see his friend John Dee in Mortlake in 1577 and Braun tells of Ortelius putting pebbles in cracks in Temple Church, Bristol, being crushed by the vibration of the bells in the description on the back of 'Brightovve' Map 2, Third Edition 1581

Q: Please explain Theatrum Orbis Terrarum?
A: Ortelius' Theatrum Orbis Terrarum, the "first modern atlas" (of 53 maps).

Q: Did Abraham contribute to this?
A: In 1573 Ortelius published seventeen supplementary maps under the title Additamentum Theatri Orbis Terrarum.
What else is important to know about this ?
The Theatrum Orbis Terrarum inspired a six volume work entitled
The Theatrum Orbis Terrarum inspired a six volume work entitled