dogesr
to check Venetian
social networks before and after the SerrataUsing data from dogesr
(Merelo-Guervós 2022), we will, in this
vignette, analyze the change of the social network before and after the
Serrata (Puga and Trefler 2014),
revealed as a watershed event in the analysis performed in (Merelo 2023)
The Serrata mainly happened during the government of Pietro Gradenigo. We will then create two networks, one including that doge, the next one with all the others
library(dogesr)
library(igraph)
pre.serrata <- marriage.graph.slice(to="Pietro Gradenigo")
post.serrata <- marriage.graph.slice(from="Marino Zorzi")
This will call the function that creates, from raw data, the
igraph
data structure with which we can work. We still need
to simplify them to be able to work with it.
weightify <- function( a.graph ) {
other.graph <- a.graph
E(other.graph)$weight <- 1
other.graph <- simplify(other.graph, edge.attr.comb=list(weight="sum"))
return(other.graph)
}
pre.serrata <- weightify(pre.serrata)
post.serrata <- weightify(post.serrata)
V(pre.serrata)$EV <- unname(unlist(eigen_centrality(pre.serrata)$vector))
V(post.serrata)$EV <- unname(unlist(eigen_centrality(post.serrata)$vector))
plot(pre.serrata,vertex.size=V(pre.serrata)$EV, layout=layout_nicely, vertex.label.cex=0.7)
The pre-Serrata graph is above, the post-serrata below. Before the Serrata, there were small (up to 4-5) sets of connected components, the biggest one the “star” around the Tiepolo family (which was an important part of the early XIV century rebellion); however, the Serrata had the effect of connecting the network, mainly because there were far many doges (as explained in (Merelo 2023)), but also because marrying became an tactical move to increase the reach of the social network.
It should be noted, however, that doges’ marriages were but a small part of the complete social network; however, it is an important sample that, besides, shows who arrived to the summit of power (or servitude to the state, depending on how you look at it)
Charting the doges social networks enables insights on the power and social dynamics of the Republic of Venice; being able to look at temporal slices is especially interesting since we can check how certain events influenced the social network.