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In page Holy Roman Empire:

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The shift in power away from the emperor is also revealed in the way the post-Hohenstaufen kings attempted to sustain their power. Earlier, the Empire's strength (and finances) greatly relied on the Empire's own lands, the so-called Reichsgut, which always belonged to the king of the day and included many Imperial Cities. After the 13th century, the relevance of the Reichsgut faded, even though some parts of it did remain until the Empire's end in 1806. Instead, the Reichsgut was increasingly pawned to local dukes, sometimes to raise money for the Empire, but more frequently to reward faithful duty or as an attempt to establish control over the dukes. The direct governance of the Reichsgut no longer matched the needs of either the king or the dukes.[citation needed]