Aoba Castle

Wind comes up from the river valley and moves through the trees around you. Under your feet, gravel crunches on a wide, open hilltop. To the east, the modern city of Sendai spreads out toward the sea, a grid of grey and white blocks softened by green. There is no tall castle keep here, no white tower with curved roofs. And that absence is the first surprise of Aoba Castle, also known as Sendai Castle. What you are standing on is the site of the main enclosure, high on Mount Aoba.

The castle belongs to one man above all others. His name was Date Masamune, a powerful warlord of northern Japan. As a child he lost the sight in one eye, most likely after an illness. Later generations gave him a nickname, the One-Eyed Dragon. He lived through the violent final decades of Japan's civil wars, a long period when rival lords fought for control of the country. Masamune was ambitious, clever, and sometimes reckless. He survived by reading the political winds with great care.

Around 1600, the great battle of Sekigahara changed Japan. Tokugawa Ieyasu emerged as the dominant power, and he soon founded the shogunate, the military government that ruled for more than two centuries. Masamune had supported the Tokugawa side. Soon afterward, he began building a new castle and a new town here. He moved his seat of power to this hill above the Hirose River. The town that grew below the castle became Sendai, today the largest city in the Tohoku region, the northeastern part of Japan's main island.

Look at the shape of the land around you. On one side, steep cliffs drop toward the river. On the other side, a deep ravine cuts into the hill. Masamune chose this place for defence. Nature did much of the work that walls and moats did elsewhere. An attacking army would have struggled to climb these slopes under fire. This is why the hill felt so secure, and why the castle never needed a towering central keep.

That missing keep deserves a moment. Many famous Japanese castles have a tall main tower, called a tenshu. Aoba Castle, as far as historians know, never had one. Several reasons are often suggested. The site was already easy to defend. The Tokugawa government also watched powerful lords closely, and a grand tower might have looked like a challenge. Instead, the main enclosure held a large and richly decorated hall for ceremonies and audiences. Power here was shown through rooms and gardens, not height.

Now turn toward the statue. A figure on horseback looks out over the city, wearing a helmet with a long, thin crescent moon across the front. That crescent became Masamune's personal symbol. Here is the second surprise. The statue you see is not the original. An earlier bronze stood here before the Second World War. During the war it was taken away so the metal could be used for the war effort. The present statue was made later, in the 1960s.

The castle's buildings had a hard modern history too. After the Meiji Restoration in 1868, when Japan ended samurai rule and began rapid modernisation, many castles lost their purpose. Here, the grounds came under army use. Much of the old structure was removed over the following decades. Then, in 1945, American air raids struck Sendai. Fires destroyed the main gate and other surviving parts of the castle. So very little original timber remains on this hill today.

What does remain is stone. As you walk the approach road, look at the great stone walls. They rise in smooth, sloping curves, built from large fitted blocks. Japanese castle masons designed these slopes to be stable, and to make climbing difficult. The walls here have been rebuilt and repaired more than once over the centuries. The great earthquake of 2011 damaged sections of them again. Careful repair work followed. The stone carries the marks of many generations of builders.

Near the lower approach, you may notice a turret with white walls and a dark tiled roof. This corner tower, or yagura, is a reconstruction from the 1960s. It gives a small idea of how the castle's defensive buildings once looked. Imagine many structures like this along the walls, with soldiers watching the paths below. Then imagine the main gate, much grander, standing nearby until the fires of 1945.

On the hilltop there is also a Shinto shrine, the Miyagi Gokoku Shrine. Gokoku shrines honour people from the region who died in Japan's wars. Its presence changes the mood of the site. Some visitors come for the view and the statue. Others come quietly to pray. If you see people bowing at the shrine, give them space. Shinto is Japan's native religion, centred on spirits called kami, and shrines like this one remain active places of worship.

The castle and its town shaped Sendai's identity. Masamune encouraged trees to be planted across the city, and Sendai later earned the nickname the City of Trees. Each summer, the city holds its large Tanabata festival, with long paper streamers hanging over the shopping arcades. The festival tradition grew under the Date family. Masamune also sent an envoy across the Pacific to Mexico and on to Europe, an unusual mission for a Japanese lord of his era.

There is a small museum on the site, along with shops selling local food and souvenirs. Inside, displays and computer-generated images help visitors picture the lost buildings. This is useful, because the hilltop itself asks you to use your imagination. The ground plan is here. The stone foundations are here. But the halls, the painted screens, and the ceremonies have to be rebuilt in the mind. Sendai specialities such as grilled beef tongue and sweet green edamame paste are often on sale nearby.

Before you leave, walk to the edge of the viewing area once more. Look down at the Hirose River, and follow it with your eyes toward the city centre. Four centuries ago, Masamune looked out from this same height at a town that he was only beginning to build. Today the buildings are taller, and the roads are full of cars. But the river still runs where it ran, and the hill still stands above it. As you walk back down the slope, listen to the wind in the trees once more.