The current Jelling church was built of limestone around the year 1100. Archaeologists have found traces of three earlier wooden churches on the site. The first wooden church built on the site of the present edifice was the largest of its kind anywhere in Scandinavia. Archaeological evidence suggests that it was built in the later 10th century, during the period around 960 when Harald Bluetooth introduced Christianity into Denmark, as he proclaims on the larger of the two runic stones.
The part of the church burned down in 1679 and it was restored with a new porch. The pulpit dates from the 1650s. Mural paintings were in bad shape until Julius Magnus Petersen replaced them with copies in 1875. Jelling church is part of the UNESCO World Heritage site with Jelling mounds and runestones.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.