The seal system of the ancient and medieval times, a uniform, inherited from generation to generation, continuous institution. Here, the average age consumed in its first half of the work of the ancients, because it used the amount in traditional ancient stone carvings.
In the second half after the transition to the metal punch craft skills developed enormously. The most significant cultural and historic period in the history of the seal system begins with this era. In this book are detailed examples of the development of forms and types of seals being, described with the various seal species and their use.
The Emperor Henry II. at the beginning of 11. Century introduced type of imperial throne was in full seal 300 Years without significant change. The seal of this period came in to the government rulers differed only in the artistic execution, in the form and arrangement of the drapery, The insignia, in the construction and arrangement of the throne, and in the size of the seal.
At the end of the 10. and early 11. Century bishop's seal are found, that neither the image nor had the inscription a reference to the person of the sealer. In the first decade of the 13. Century reappears on the round seal coat. The oldest seal of this type is that of Hermann of Lippe, It has been proven safe 1281-1221.
The transcriptions of genealogical data usually refer to a high or at least honorable family of the seal holder. Rarely is the addition of a biography of the corresponding date. The historical information relating to the acquisition or modification of a seal, on privileges or very distant events of a general nature.
Seyler, Gustav Adelbert: History of the Seal, Leipzig: Publisher Friesenhahn 1894 (Download)