It is split into two branches ; the elder is known as the House of Welf-Este or House of Welf ( Guelf or Guelph ) , and the younger is known as the House of Fulc-Este or later simply as the House of Este .
The elder branch known as the `` House of Welf-Este '' or `` House of Welf '' ( Guelf or Guelph ) . The younger branch is known as the `` House of Fulc-Este '' or later simply as the `` House of Este '' .