You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.
Q: Paragraph- Sent 1: Despite the regard in which he was held by the Venetians, Durer returned to Nuremberg by mid-1507, remaining in Germany until 1520.
Sent 2: His reputation had spread throughout Europe and he was on friendly terms and in communication with most of the major artists including Raphael, Giovanni Bellini and -- mainly through Lorenzo di Credi -- Leonardo da Vinci.
Sent 3: Between 1507 and 1511 Durer worked on some of his most celebrated paintings: Adam and Eve (1507), The Martyrdom of the Ten Thousand (1508, for Frederick of Saxony), Virgin with the Iris (1508), the altarpiece Assumption of the Virgin (1509, for Jacob Heller of Frankfurt), and Adoration of the Trinity (1511, for Matthaeus Landauer).
Sent 4: During this period he also completed two woodcut series, the Great Passion and the Life of the Virgin, both published in 1511 together with a second edition of the Apocalypse series.
Sent 5: The post-Venetian woodcuts show Durer's development of chiaroscuro modelling effects, creating a mid-tone throughout the print to which the highlights and shadows can be contrasted.
Sent 6: Other works from this period include the thirty-seven woodcut subjects of the Little Passion, published first in 1511, and a set of fifteen small engravings on the same theme in 1512.
Sent 7: Indeed, complaining that painting did not make enough money to justify the time spent when compared to his prints, he produced no paintings from 1513 to 1516.
Sent 8: However, in 1513 and 1514 Durer created his three most famous engravings: Knight, Death, and the Devil (1513, probably based on Erasmus's treatise Enchiridion militis Christiani), St. Jerome in his Study, and the much-debated Melencolia I (both 1514).
Sent 9: In 1515, he created his woodcut of a Rhinoceros which had arrived in Lisbon from a written description and sketch by another artist, without ever seeing the animal himself.
Sent 10: An image of the Indian rhinoceros, the image has such force that it remains one of his best-known and was still used in some German school science text-books as late as last century.
Sent 11: In the years leading to 1520 he produced a wide range of works, including the woodblocks for the first western printed star charts in 1515 and portraits in tempera on linen in 1516.
A: 
What is the most productive period in the creative career of Durer?